Articles, Blog

The BCN3D Sigma R17 Review?

October 12, 2019


Dual extrusion has arrived, in a big way,
and the fact that you need two filament paths is being solved creatively in a bunch of different
ways: Either you’ve just got two fully featured hotends moving around at the same time, which
does pose the issue of the inactive one oozing its filament onto your print. Then there’s the option of lifting one hotend,
but unless you do that perfectly, it’s only going to cause more issues than it solves. Other setups use just one hotend and feed
two or more filaments into it, one after another, but the BCN3D Sigma does things its own way
– it just adds a second carriage and moves the idle hotend out of the way. Crutch or clutch? Let’s find out. So this is BCN3D’s current version of the
Sigma, commonly referred to as the R17. I’ve not used the previous version, so I
can’t really tell you what’s changed, but I can tell you about how well this machine
performs in absolute terms. Now, just to get it out of the way, yes, the
most obvious machine to compare this to is the Ultimaker 3. And that has been my reference for all the
testing I’ve done on the Sigma, but you have to realize that they are very different
machines at their core and each one has its focus in a different area. Let’s leave all the direct comparisons to
another video and just focus on the Sigma for now. So the first thing that’s going to stand
out is the machine’s looks – it’s aggressive, it’s mean, its frame is massive aluminum
and with the linear motion components glowing in the purple LED lighting, there’s a distinct
“modern” aura around the Sigma. It’s a very hefty machine, except for this
wobbly plastic cover, and its large footprint comes with an equally large print volume of
roughly 300x210x210mm or 12x8x8 inches, basically the size of an A4 sheet of paper as a build
surface. There’s a lot of seemingly empty space to
the left and right of the glass build plate, because that’s where the Sigma has its parking
positions and waste buckets for the hotends. You get a fairly large touchscreen up front,
flanked by an SD card slot, and a USB port on the back, which you can use to connect
the Sigma to a computer for tethered printing. And yes, there’s no networking built in,
neither through wired Ethernet nor through WiFi, which is a shame, considering the Sigma
sells for almost 2655€ including tax or 27 hundred US dollars plus tax. But the thing is, the Sigma still runs the
Marlin firmware on an 8-bit processor, which has plenty of horsepower for regular printing,
but doesn’t exactly just let you plug in a WiFi dongle. Though adding OctoPrint with a separate Rapsberry
Pi is trivial if you want networked printing. But the star, or stars of the show here are
the dual independent extruders, dubbed IDEX. This really is the core of why the Sigma exists. The hotends in here are similar in concept
to E3D’s, but not quite identical in all their dimensions. So this is a dual extruder setup, with two
hotends, two bowden extruders, but also two X-axis-carriages. That means, that whenever it’s using one
of the two hotends, it can park the other one off to the side. This reduces the moving weight on the X-axis,
but most importantly, moves that second, idle hotend over a waste bucket with a wiper, where
it can ooze as much filament as it want, and just before switching hotends, it primes the
idle one into the bucket and wipes it clean with this flexible lip. This works great, and dual extrusion prints
come out perfectly clean, without any extra oozy bits of the wrong filament stuck in the
print. And there’s no priming tower that could
get knocked over or otherwise ruin your print. Having two independent X-carriages means aligning
the two hotends is a bit trickier than if they were just next to each other, but BCN3D
are including a powerful calibration routine on the Sigma. It feels a bit like the calibration you’d
do on an a 2D inkjet machine to align the printhead, and at its core, it’s doing pretty
much the same thing. The first time you start up the Sigma, it
starts by adjusting the printbed, which uses an assisted manual leveling or, more precisely,
tramming approach, with a microswitch on each carriage and the two adjustment knobs on the
front. The rear mounting point of the bed is fixed,
which gives the machine an absolute reference for height and it means you’ll never exceed
the adjustment range on each of the thumbscrews, which is something that some other machines
often struggle to work around. The microswitches measure the glass bed surface
and the only thing left for you to do is to turn the left and right adjustment knob by
the amount the machine tells you to. After that, the absolute nozzle height is
calibrated, as usual, with a piece of paper with very specific instruction on how to hold
it, and just to reconfirm everything, the machine then prints a test pattern and lets
you pick which of the test strips looks best to you. And I think this last test is something that
more machines should do, as it gives you that visual confirmation that your adjustment is
correct. It does the same for the second hotend, and
then a few more tests to align both hotends in X and Y direction. And the results of this process are really,
really good. Though the process itself could use some tuning
in my opinion, if you do the full run, it takes quite a while to complete, and the interface
isn’t always totally logical if you’re not super concentrated. For example, not just in the calibration menus,
but everywhere else, too, pressing “up” on the Z-axis screens moves the hotend closer
to the bed, which would be the negative, down direction, in the printer’s own coordinates
and in any host software, but in this case it refers the bed itself moving up and down. The menu structure in general could use a
bit more work, too, just to get it closer in line with what we’re used to from smartphones
these days. And to make the entire thing more stable,
because right now there are still quite a few bugs in the interface. But in general, just having that large touchscreen
instead of a clickwheel and a tiny display makes this printer not just easier, but also
a lot faster to use. So the rest of the hardware is mostly as expected
– nice linear rails, 2GT belts, but for the Z-axis, they’re sticking to 12mm smooth
rods and a trapezoid spindle. The spindle is fine, but the unsupported rods
and the enormously long printbed do tend to visibly shake about as the rest of the printer
moves. I’m not sure if this explains some of the
inconsistencies I’m seeing in the prints, but it’s definitely not the greatest design
choice using unsupported rods here. Print quality overall is ok, it’s not super-duper-awesome,
but it’s very usable and most of the things I’m noticing can be worked around in software. For the most part, that would be some slight
gaps in top layers and ringing. Quite a lot of ringing, actually. It can be dealt with by lowering the acceleration
settings, and the underextrusion is just a slicer setting or firmware update away. Manually bumping the extrusion multiplier
by about 10% fixed the gaps I was seeing with, basically, all materials. Now, for the Sigma, slicer profiles are something
that isn’t baked in anyways. BCN3D let you generate them through their
Progen website for each material and nozzle size and quality setting. And this gives you print profiles both for
Cura 15.04 or for Simplify 3D. Now, there is an 8-month-old build of a Cura
BCN3D edition available, and I’ve been using that for the most part, but I didn’t find
any differences to Ultimaker’s official Cura build, other than all references to Ultimaker
being replaced by references to BCN3D. And not having any changes isn’t a good
thing. If you look at even what for example Lulzbot
are providing with material and quality selection in their custom version of Cura, or Prusa
with the Slic3r build, BCN3D just having you manually load a new ini file for each new
print setting or material choice feels utterly inappropriate. And on top of that, Cura 15.04 is complete
garbage for dual extrusion. Yes, it does support multiple extruders, but
it’s lacking so many essential features. You don’t see which parts of your models
are going to use which extruder unless you memorize which color is which, so I took a
shot in the dark and ended up with a false-color R2D2. Even for single extrusion where you just use
one material, there’s no easy way to have your model printed with the second extruder
instead, so if you have a different material or color loaded in the second slot, you can’t
really print with it unless you’re also using the first one. And support material generation, particularly
if you’re going to print with water-soluble PVA supports isn’t great, either. It uses a lot of the expensive PVA, there’s
no option to use cheaper PLA for the inner parts of the support material that don’t
need to be soluble, like with this battery holder that I could have easily printed with
PVA supports, but it would have used a ton of PVA, so I decided to split it into two
parts instead. I also ran into a configuration issue where
the Cura profile was configured with quite a large gap between the support material and
the actual build material, which is great if you’re using PLA for both the build and
the support and don’t want it to stick too well, but in the case of PVA, the part I tried
to print ended up detaching from the support material. Because BCN3D haven’t made Cura 2 work with
the Sigma yes, and, in my opinion, Cura 2 overall has turned into the best slicer option
out there right now and is pretty awesome for dual extrusion, because that option is
not there yet, your only choices if you want to make use of the dual extrusion are to either
configure the Sigma in Slic3r or Cura 2 yourself, which is non-trivial, or you can buy into
Simplify 3D. I’ve asked BCN3D and their answer was basically
yeah, just use Simplify 3D, if you’re seriously planning on using Cura 15.04, you are going
to be crippling your shiny new 3D printer from the start. I try to review commercial hardware as it
is shipped, because there are infinite aftermarket options in how you can tweak the experience
you have. As it stands, the Sigma only ships with Cura
15.04 and not with Simplify 3D. And I’m not a huge fan of Simplify 3D aynways,
both for it being overly complicated and for the fact that it’s closed-source, riddled
with DRM, aka digital restrictions management, just maybe a bit overhyped, and of course,
also a $149 purchase on top of your machine cost. Sure, in relation to what you’re paying
for the Sigma, it’s not a huge deal, but just image if all those people buying Simplify
3D would have funded an open-source slicer instead. That would be an amazing piece of software! Instead, we have Simplify 3D. I tried the custom support material generation
that Simplify 3D is often praised for and the supports just ended up fusing to the part
instead of coming loose easily. And I’m not quite sure why BCN3D are promoting
Simplify 3D so much, because it does clash with their own open-source philosophy. BCN3D have done an awesome job on the Open-Source
side of the Sigma. Not only are you getting all the CAD files,
but also the bill of materials including suppliers, you’re getting manufacturing drawings, the
full package. So if you ever want to modify or fix anything
on the Sigma or even build a printer based on it, you’ve got everything you could ever
want for that. And I don’t think anyone else, other than
of course Lulzbot, are doing Open Source this thoroughly. And it does feel like BCN3D have put a lot
of attention to detail into this machine. Starting with having Trinamic drivers right
next the motors to reduce EMI and stray inductance, then the very usable spool mounts inside the
printer frame, which allow you to take out each spool without having to touch the other
one – yay – and lastly the magnetic quick-release glass bed, which relies on the included can
of 3DLac to get adhesion, and that works great, but I’m sure you could also just print PLA
onto the bare glass instead. However, things aren’t perfect, as those
same spool mounts mean that the water-soluble PVA support material will be constantly exposed
to ambient moisture, which could render it unprintable quite fast. The ESUN or Matterhackers PVA is a standard
type, so it dissolves very easily, even in cold water without agitation, but it also
sucks a lot more moisture out of the air than some of the custom types. Also, the heated bed PCB has a huge gap to
the glass and takes forever to heat up even for PLA, and PETG and ABS are just a chore
to print, the LCD menus feel undercooked and the firmware even freezes with non-Sigma gcode
files on the SD card. And the noise level of the entire machine
supposedly has been improved compared to the previous generation, but it’s still not
exactly a quiet machine. BCN3D have already addressed some of the software-fixable
issues, like what we saw in the live unboxing, where the idle extruder head would constantly
lose its positioning, that turned out to be a bad sample gcode file, if you freshly slice
new designs, the motion system works perfectly. And I know the rest of the hiccups and especially
the slicer situation will also be solved down the road, but it would have been nice to have
all this stuff tested for and taken care of before releasing and shipping the machine. Again, I hate comparing the Sigma to the Ultimaker
3, but it was a very similar story there late last year, where the machine shipped with
some issues that should have never made it out the door. Tough management and rigid deadlines in both
cases? Sounds like it. But please, BCN3D, I know you’re working
on Cura 2 support etc, don’t rush them out. Do it ^right. I know this might be a stereotypical clash
between German and Spanish philosophies, but I’d much rather have a release a few weeks
later if that means you’ve taken some extra time for testing and tweaking. It doesn’t change the fact, though, that
the dual-extrusion system itself in the Sigma works flawlessly and is probably the most
universal and overall just the best system for dual-extrusion out there right now. Having two independent hotends, getting the
idle one out of the way and priming it outside the build area is priceless, it just works
really well. The calibrations wizards also do their job
marvellously, but overall it feels like, right now, the software and firmware are really
holding back what the machine is capable of. And because of that, I don’t think I can
really come to a final verdict on the BCN3D Sigma R17 yet, there are still a few too many
open questions that I have. Let’s just say, there’s going to be more
content on the Sigma R17 vs. Ultimaker 3 maybe in, like two months, when everything should
have settled in a bit? Because the thing is, when you’re buying
a 3D printer for 27 hundred bucks, you’re probably going to keep it for a while and
you’re going to see a few software and firmware iterations throughout its lifetime, even if
that part not perfect right now. I know that is an unsatisfying conclusion,
but I don’t think the current state of the Sigma lives up to what BCN3D had envisioned
with it. So I guess, yeah, I’m looking forward to
what BCN3D do next with the Sigma, there’s a lot of potential there. If you agree, hit that like button and I’d
love to know where you guy have your priorities – would you rather have a stripped-down machine
with great software or a more complex package with everything being a bit unfinished? To stay up to date on how the Sigma evolves,
get subscribed and click the bell so that YouTube will actually send you notifications
as new content gets uploaded. If you want to support this channel, check
out the affiliate links in the video description where you can buy the Sigma or anything else
on Amazon, Matterhackers, ebay, igo3d or Aliexpress, and yes, I know I could be making a lot more
money through those links if I just praised every product I reviewed and tried to get
you to buy one, but that just wouldn’t feel right. And thankfully, because of the great support
I’m getting from all of you on Patreon etc, I can freely talk about my experiences with
the products I test without having to worry about losing sponsorship deals etc. So that’s is much appreciated, if you want
to chip in a dollar or two per month or join in monthly Q&A hangouts, you can do that over
on Patreon. So yeah, that’s it for today, thank you
for watching, and I’ll see you in the next one!

100 Comments

  • Reply Code-Grammar March 31, 2017 at 9:02 pm

    Cool I want it!

  • Reply Tom O' S March 31, 2017 at 9:05 pm

    Any chance your gonna do another controller board review series in the future?? Im loving the look of this one
    http://www.panucatt.com/azteeg_X5_mini_reprap_3d_printer_controller_p/ax5mini.htm
    Like to see what you think of the boards these days

  • Reply BitKrieger March 31, 2017 at 9:14 pm

    3:05 "this reduces the moving weight on the x-axis" – wait what? no – how? The idle hotend still needs to be moved around with the machine

  • Reply Eros Nicolau March 31, 2017 at 9:22 pm

    One straight-forward, off the bat speed optimization proposal: starting the spin/heat-up of the next printing head before the current one finishes printing its part, thus removing the painfully obvious lost times when switching to and fro. It's a simple slicer option in theory, as long as there's a will to implement that. In terms of cost: for almost that much, one can buy a resin printer… Just having a very nice dual extrusion idea (albeit spiced up with that nice LCD interface) is definitely not enough for such a huge price tag, IMHO.

  • Reply Oliver Jackson March 31, 2017 at 9:22 pm

    I know you mentioned why you didn't use simplfy3d but still I thought you might as well give it a shot would have made the video a tad better imo.

  • Reply Chase McNamara March 31, 2017 at 9:23 pm

    Great review, the hardware of this machine is beautiful.

  • Reply ntesla66 March 31, 2017 at 9:24 pm

    That dual hotend parking routine on linear rails is sweet. The Trinamics right up close to the steppers is sweet too. Makes me want to build a machine based on these concepts. Thanks for the honest review Tom.

  • Reply TheSickness1234 March 31, 2017 at 9:24 pm

    Those prices tho…but got to have the hipster design frames today

  • Reply Sevendogtags March 31, 2017 at 9:24 pm

    This is the content that I love!
    Thank you!

  • Reply Supernielsen March 31, 2017 at 9:26 pm

    I like it.. But mostly for you agreeing with me on the simplify3D part.. 🙂

    I would be awesome if you could give us a quick roundup on the different slicers.. Atm im using craftware.. 🙂

  • Reply traced March 31, 2017 at 9:28 pm

    Hey Thomas, whats your favourite slice? Thanks!

  • Reply Mega Making March 31, 2017 at 9:31 pm

    The biggest limiting factor for multi-materials 3d print is the software toolchains. Even with other multi-materials printing methods, there are ways that slicers can make them better or at least work around the issues. however, the majority of the slicers only support very rudimentary and hackish methods. Totally agreed with you on simplify3d as well.

  • Reply Lauri Hakkarainen March 31, 2017 at 9:32 pm

    Thanks for the great, well thought review!

  • Reply 3D Printing Nerd March 31, 2017 at 9:37 pm

    Hey Tom! Thanks for the incredibly well thought out review on this machine! I'm starting to put together my review for the machine, and I'll definitely link to yours when I'm done.

  • Reply Pook365 March 31, 2017 at 9:39 pm

    I'm confused by the pricing of Simplify3D, they'd just make more money if it cost less.

  • Reply Pook365 March 31, 2017 at 9:40 pm

    Ooh Titan Aero! 🙂

  • Reply mindmantv March 31, 2017 at 9:43 pm

    I agree with you Tom! It should not leave the factory door without everything being ready for a production environment. I say this because its price tag puts it at the level for the more professional market, not just for the maker market. Us makers make things work, but not everyone is a maker! Great Video, I look forward to see how quickly they fix the issues. Your input, I am sure, is valued @ BCN3D. Thanks for the vid!

  • Reply ManWithBeard1990 March 31, 2017 at 9:43 pm

    Actually it's more similar to the Leapfrog Bolt from what I can tell. (have been getting loads of google ads for it lately… annoyingly so, actually.)

  • Reply Calvin Stence March 31, 2017 at 9:47 pm

    It sounds like you're saying "Slick VR" instead of "slic3r". That confused me for about a year.

  • Reply TK's 3D Prints March 31, 2017 at 9:50 pm

    great review 🙂

  • Reply skaltura March 31, 2017 at 9:52 pm

    In other words, the machine pretty much sucks, apart from the dual extrusion method they came up with

  • Reply 3D Printed Aspie March 31, 2017 at 9:54 pm

    What a F**king beautiful piece of Video Editing Mr Tom.
    Perfect and very Professional.

  • Reply Psysium March 31, 2017 at 10:03 pm

    Thanks for another thoughtful, informative video. I always look forward to your uploads.

  • Reply Stan V March 31, 2017 at 10:04 pm

    The dual extrusion method is interesting, but I find the quality unacceptable.

  • Reply Adria Uria Ciurana March 31, 2017 at 10:25 pm

    Hi Thomas, you say that it's only possible to print with the second extruder when the principal is also working. I was told from one guy who works with these machines that if you want to do so, you need to add a line on the start of the Gcode. I don't remember what exactly you need to write and I don't have either a sigma printer, but if you ask them, they may told you.
    I know it's not the best solution, but at least fixes it.

  • Reply peterthinks March 31, 2017 at 10:53 pm

    If something is released, especially at that price point Everything about it should be perfect. I agree that a feature should be stripped off the machine rather than shipped partially working.

  • Reply Carter Peel March 31, 2017 at 10:54 pm

    I really want one of these printers. I cant get good quality with my FFCP. It keeps failing there is something wrong with it. 🙁

  • Reply Acrimonious Mirth March 31, 2017 at 10:59 pm

    Question: seeing as you like Cura so much what are your thoughts on Simplify 3D and Mattercontrol? I've used all three and prefer Simplify 3D and Mattercontrol for different reasons with Cura being a bit disappointing.

  • Reply Osimmac March 31, 2017 at 11:12 pm

    That Z axis looks like wobbly trash. Great printer other than that one flaw.

  • Reply The 3D Printer March 31, 2017 at 11:19 pm

    Im sensing a love hate for Simplify3D. Great review.

  • Reply JulianGoesPro March 31, 2017 at 11:45 pm

    Are you really blaming BCN for not including S3D? 😀 I can understand a 300$ printer relying on a 100+$ software is nuts but in that price range…

  • Reply KmanAust April 1, 2017 at 12:09 am

    I cant believe that a printer that looks so solid externally shakes around so much internally. In your close up shot, it's clear that there is movement all over the place. It's only a little but it doesn't matter. Why is that hard for manufacturers to understand. Am I expecting too much?

  • Reply Matthew Schaff April 1, 2017 at 12:13 am

    I want one really bad!

  • Reply Ralph April 1, 2017 at 12:13 am

    Is there a way to accomplish this with Marlin + RAMPS? I can get it figured out mechanically.

  • Reply David Owens April 1, 2017 at 12:30 am

    Top man Tom – great video

  • Reply h1hummerh3t April 1, 2017 at 1:06 am

    i want a 1.75mm version

  • Reply michaelosully1 April 1, 2017 at 1:22 am

    Or just buy an ultimaker for a small bit more.

  • Reply Phoenix 3D Solutions April 1, 2017 at 1:28 am

    How does it handle TPU?? I have been on the edge about it as I can't get a straight answer in TPU

  • Reply Shinuza San April 1, 2017 at 1:37 am

    You are making the assumption that if every penny that was invested into S3D were invested in a OS slicer instead you'd automatically get an awesome piece of software. That's just terrible logic.
    Imagine putting a million dollars into Slic3r for example, you probably drive people to contribute to the project, it doesn't mean they would be good at programming, integrate well with the current contributors team or make the project move forward. And this would be funding a project that's actually proven to work, don't get me started on funding a project from scratch.

  • Reply Game of Knowing April 1, 2017 at 2:05 am

    Hey Tom, great video! With no other factors taken into account, what would you say is the quietest printer you've tested? I'm a college student looking for a second machine that I can use without annoying my roommates.

  • Reply Randall Bourque April 1, 2017 at 2:39 am

    Amazing how different your views are from most reviews. Very honest. Thanks Tom!!

  • Reply Gavin Seim April 1, 2017 at 2:54 am

    Thanks for this. Shame they did not get this ready to ship before doing so. Maybe next version. For now I'll be waiting for my MK2 multi material upgrade.

  • Reply Eddy_D April 1, 2017 at 3:04 am

    Slicing and firmware seems a bit rough considering the price that they want. Mechanically it looks fine (apart from Z-axis support issues).
    Thanks for the unbiased review.
    – Eddy

  • Reply Hoffman Engineering April 1, 2017 at 3:25 am

    I am still a big fan of Slic3r for dual extrusion. The ability to customize each part's settings independently is a big plus, and you can easily designate which extruder prints which part. Great review of the Sigma!

  • Reply Alejandra Rivadeneyra April 1, 2017 at 4:46 am

    hi Tom. I've had the sigma 2016 for almost a week and I can say you can assign a color for the first a second extruder in the cura preferences so you don't make color mistakes. Also you can definitely print with just the second extruder just by adding T1 in the g code. hope this helps ☺

  • Reply colbster threeohtwo April 1, 2017 at 4:48 am

    The audio on these videos is like you're behind the camera or… in the camera… [fire emoji] [fire emoji] [bomb emoji] [thumbs up happy-face emoji]

  • Reply Google+ SUCKS BALLS - the worst forced social network April 1, 2017 at 5:42 am

    Great review as always, but seems like all the expensive/overpriced stuff ends up on this channel.. who buys this crap? companies who don't know better?

  • Reply István Gáspár April 1, 2017 at 6:16 am

    3D printers start to look like 2D printers… finally?

  • Reply Da Hai Zhu April 1, 2017 at 6:40 am

    Much more thorough and honest review than that "other guy's". Thank you for telling it straight.

  • Reply Michael Damien April 1, 2017 at 7:20 am

    How is Simplify3D too complicated when Cura has exactly the same set of available options?

  • Reply Agustín Arroyo April 1, 2017 at 8:31 am

    Great review! You're one of my key references to improve my videos, but I still don't have your manly voice.

  • Reply fritmoule April 1, 2017 at 8:32 am

    D2R2 evil twin 🙂

  • Reply Jeff Th91 April 1, 2017 at 8:42 am

    How does the sigma compare to the leapfrog Bolt, which has a simelar setup?

  • Reply baughaninastorm April 1, 2017 at 10:29 am

    well done for not buying into the s3d hype train tom

  • Reply TheManfet April 1, 2017 at 10:55 am

    yey Titan Aero in background, can we get a weight comparison to the normal Titan Setup? Would love to put it on the delta but I guess it will still be too heavy. Would love to know if I should still go for flying extruder or just buy the aero kit.

  • Reply RJ_Make April 1, 2017 at 11:36 am

    Tom, utterly fantastic review. Thank You! There is only 1 other YouTube reviewer that I'm subbed to that I feel I can 100% rely on for an unbiased (well as much as is humanly possible) evaluation of a product. This is just one of the reasons I support you through affiliate links and Patreon.

    I'm sure Sigma views this as a 'negative' review, I however don't. This machine has some amazing possibilities, and I truly believe that over time the company will mature and learn how to achieve greatness. If you're reading this BCN3D, I would love to see a fully enclosed option.

  • Reply MortarRiding April 1, 2017 at 11:50 am

    I'd be happy with a solid, bare bones, dual extrusion printer with this system, with zero software, or any other help. I'm a bit of a die hard rep-rap user, and so the main thing I want is the tool. I'll figure out my way to do everything else, especially with firmware like Marlin, that is quite familiar to me.

  • Reply charles yang April 1, 2017 at 12:50 pm

    Hello Thomas!Why there are many vertical grains on my print object?how can i slove it! I use drv8825 driver at 1/32 microstep.Thanks

  • Reply Robert Torres April 1, 2017 at 12:58 pm

    Thanks for being open about how you feel about these products.

    Have you done any testing of the Flexy Dually for the Lulzbot Taz 5 or Taz 6 yet?

  • Reply Marcus April 1, 2017 at 1:54 pm

    in a perfect world yeah ☺

  • Reply Charles-A Rovira April 1, 2017 at 3:06 pm

    They should take the time to test before shipping.

  • Reply Mark Peeters April 1, 2017 at 4:38 pm

    how fast do the idle print head drool buckets fill up? I can imagine they would get full quickly if you were doing a long print that filled the print bed more than a tiny benchy. Can you empty the bucket mid print?

  • Reply Daniel April 1, 2017 at 5:45 pm

    Loved your comment about the differences in spanish/german business philosophy. As a spaniard I completely agree with you.

  • Reply Victor García April 1, 2017 at 5:55 pm

    So, great concept but bad implementation? plus it is expensive

  • Reply Igor Vlasiuk April 1, 2017 at 7:00 pm

    When will be series of building cheapest Sigma from ali express similar to Prusa?

  • Reply Instvogel April 1, 2017 at 8:27 pm

    Too bad i missed you at CeBit! I would have loved to talk to you!

  • Reply Ejal Nvt April 1, 2017 at 11:55 pm

    Great review! When will you be making an "expensive" (1000 euro?) 3d printer series?.. linear rails.. dual extruders.. all the great stuff.. I've been dreaming about it after your MK2 clone series 🙂

  • Reply Tiago Ferreira April 2, 2017 at 12:51 am

    Hi Tom!
    Great review as usual! But i got a question to ask you! In the video you said that some of the shaking on the printer were due to the unsupported rods. What you mean with unsupported rods? The way they secure the rods seems to me very similar to the solution used on the Ultimaker.
    Thanks!

  • Reply John O'Shaughnessy April 2, 2017 at 1:05 am

    NIce, even-handed review. Looks like a printer to watch!

  • Reply Anson Mansfield April 2, 2017 at 5:39 am

    Can this be used to print multiple models simultaneously? Like if I want two identical mirrored parts can I load the same filament in both extruders and print one half with each head?

  • Reply All About 3D Blog April 2, 2017 at 7:51 am

    Great review Thomas! I own the first version of the Sigma which is a really great reliable machine. I also agree to what you said about Simplify3D …. no inovative dual extrusion features and very expensive. I personally would not buy S3D again.

  • Reply Jasper Janssen April 2, 2017 at 2:31 pm

    For 2k5, I want good hardware and good software. Under a grand and I'm willing to make the choice.

  • Reply Radek Goláň April 2, 2017 at 4:15 pm

    Thomas Sanladerer, DRM is Digital Rights Management, not Digital Restrictions Management.

  • Reply George Robles April 2, 2017 at 7:37 pm

    excellent review thank you Tom please keep up the good work

  • Reply Logan Henry April 2, 2017 at 10:14 pm

    FINALLY! A Youtuber who isn't obsessed with their complementary Simplify3D license. Thanks for the review, Tom.

  • Reply Abuzz Designs April 2, 2017 at 11:47 pm

    Thanks for a super informative and well thought our review. I love the idea of the sigma, but for the price tag I kind of expect things like software options to already be available upon release. I'm also really surprised about the lack of wifi, although that wouldn't be a deal breaker by any means. I look forward to your updates on this machine.

  • Reply Austin Steingrube April 3, 2017 at 6:56 am

    The fact that the cooling fans stop when I'm idle worries me…

  • Reply John Totten April 3, 2017 at 6:48 pm

    Since its marlin based have they provided the code on github for their calibration routine?

  • Reply Jim Neill April 3, 2017 at 9:04 pm

    For those of you interested there is a project on Thingiverse that is close to completion I think that has a similar dual extrusion set-up. You can find it over here…http://www.thingiverse.com/thing:1790970

  • Reply dubbbear April 3, 2017 at 9:45 pm

    We bought this printer at my workplace.
    It has been a big letdown for us. The under extrusion is not a software fix away.
    printer has serious problems and after a email or two tech support just stops replying.
    If i could trade it for a zotrax or an ultimaker be so happy

  • Reply Mark Lee April 4, 2017 at 8:07 pm

    Hi Thomas. As usual, I treasure your videos at their core because of your capacity for objectivity. As someone who is new to hands-on 3DPrinting (I only received my 1st printer last week, a Trinus from Kickstarter), I find you a valuable resource that is useful to all levels of expertise.

  • Reply ken fetter April 6, 2017 at 7:56 pm

    Thomas I am building a 3D printer I would like it to be Dual extrude,
    can you give me you opinion on what would be the best but yet
    inexpensive boards to drive the thing with. it seems the more I learn the more confused I get

  • Reply Calvin Witt April 7, 2017 at 12:41 pm

    It seems to me like they have a promising machine it just feels like they dropped the ball at the end there :/… I feel like with some tweaks it has potential I just wonder why they never did a "basic" enclosure to keep humidity and noise issues down?

  • Reply ostrichbean April 8, 2017 at 4:58 am

    12:03
    Just to let people know, the issue with the firmware freezing has now been fixed in the latest firmware (1.2.3)

  • Reply MONTY April 8, 2017 at 1:47 pm

    Cura is horrid to use. The interface is bad not user friendly at all.

  • Reply Raphaël Casimir April 10, 2017 at 10:28 am

    Tom, BCN3D will release cura 2 soon, according to Twitter

  • Reply Outpost 31 April 27, 2017 at 2:19 am

    Great review, so for printing something like PLA and Ninja Flex together what nozzle sizes would you recommend?

  • Reply TJ Terry May 2, 2017 at 11:56 pm

    Hi Tom, I was curious now that things are settling in I am curious to how the printer is doing? Any quick comparisons to the UM3 for someone trying to decide between the 2?

  • Reply AurorA 360 May 27, 2017 at 6:55 pm

    Thanks so much for the review of this printer, was going to invest money in buying one, well not anymore ! for the price this printer could be a lot better, this one looks like it needed a lot of work to be done.

  • Reply Bob Hepple July 15, 2017 at 7:03 pm

    Id rather the software was properly done as well, purchased this machine last year binned cura and went to S3D had some success but the Firmware is buggy, I would of liked to see a few more sample prints in the Review, but on a whole your view is same as mine. Honesty though you cant beet it.

  • Reply lef 149 July 18, 2017 at 12:40 am

    My 3D printer in an Anet A8 i prnted the same part multiple times with no problem. Now i am getting a problem every now and then. If you look at the photo the center round part is suppose to be in the center but halfway through the print it shifted to the correct spot. can anyone help me as to why it may be doing this?

    https://ibb.co/eGrmfF

  • Reply Dennis Mabrey July 28, 2017 at 3:52 am

    Seems there is no spec for printer speed anywhere. Can you give a comparison on how fast it prints? Is it as slow as an Ultimaker 3?

  • Reply John Shelton September 22, 2017 at 12:39 am

    could you do a review of the rostock max v3

  • Reply Barut Tech November 5, 2017 at 9:05 pm

    Simplify 3d=150$
    Cheap 3d printer kit from china =150$
    Hmmmm

    Just download simpljfy 3d from piratebay

  • Reply Glen Lewis November 22, 2017 at 12:22 am

    After watching your review, I set about making a BCN3D-Sigma from scratch. I used the open source files and made the entire machine, even the motherboards….we made 2 of them complete.
    We have now almost finished them and have been printing loads of stuff…..we made a lot of changes to it based on yours and a couple of other reviews. Z Axis is now very strong and there is no ringing at all! Filament and the extruders are now on the outside of the machine and we have a full enclosure with fan/hepa filter and temp controlled via our custom screen and firmware.

    We will be doing a full review of our efforts soon, and for those who may be interested……..we are considering offering our enclosure and other upgrades for purchase very soon. 🙂

    Thanks to your review, we have created a very awesome printer….so a big thank you

  • Reply Vlad B December 10, 2017 at 1:15 am

    That heat bed and glass gap, just facepalm… 🤦🏻‍♂️

  • Reply Stephen-TheLightSpeed! !! January 14, 2018 at 4:15 am

    Thomas Salanderer would you recommend this printer over the T-Rex 2+? It has IDEX also, and seems to work better than Sigma?

  • Reply Guy Wolf February 21, 2018 at 7:27 pm

    I like simplify 3d

  • Reply Bob Hepple June 10, 2018 at 7:04 pm

    I hit the dislike btn NOT that I dislike the video I dislike the product – Tom Hit on a few problems especially the Ringing, The machine is not good, the Firmware is Very buggy the motion system is very complicated if there is a problem it is a nightmare to work on, would I ever buy another BCN NO would I ever buy another Ultimaker Yes, the print quality is also suspect as in the last shots of the Pig – zits abundant and NO you cant get rid of them, worst machine I purchased….. (rant over)

  • Reply _Riot October 15, 2018 at 11:30 pm

    I would take it more seriously if it looked less "gamery"

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