|
Blackchamber posted:I have a question about the ABS plastic used in 3D printing, and that is: Are all abs plastics the same? For the most part they are the same I think. Natural just refers to the color, which means there is no added dye, it just looks kinda off-white. That said, the dyes allegedly can change the characteristics of the filament like melting point somewhat. For example a colored filament might have a slightly different temperature at which it prints best compared to natural.
|
#
?
May 1, 2012 03:39
|
|
|
|
| # ? May 20, 2024 10:31 |
|
|
Colour absolutely modifies the physical properties of a plastic, it's unavoidable. That said, you or I would probably never notice the differences, the additives are chosen for minimal interference, along the lines of 0.5% differences in elasticity, modulus etc.
|
|
#
?
May 1, 2012 06:09
|
|
|
Blackchamber posted:I have a question about the ABS plastic used in 3D printing, and that is: Are all abs plastics the same? Absolutely not. Let's compare ABS to another plastic: HDPE. HDPE stands for high-density polyethylene, and like it's name implies, is pretty much pure Polyethylene. They make milk jugs out of it. That males it easy, HDPE is HDPE ABS stands for Acrylonitrile butadiene styrene. To simplify: Acrylonitrile is a plastic. Butadiene is a synthetic rubber. Styrene is a plastic. All of these have wildly different melting points, wear properties, and costs. ABS is a mixture of these three to get a good balance. More to the point, how many ways can you mix three things? (the answer is infinite) Even if we restrict ourselves to common proportions (15 to 35% acrylonitrile, 5 to 30% butadiene and 40 to 60% styrene) you can still run the gamut from very rubbery to very brittle. When you're talking about something as finicky as an extruder, tiny variations in melt point, viscosity and so forth matter. This bites people in the rear end all the time, and they don't even know it. For example a new filament supplier will show up offering ABS at some cheap random proportion and then people wonder why it gums up extruders. All the supplier says is that it's ABS and that's all the buyer knows to look for. Technically the material sheet will tell the whole story, but it's rarely provided an most people wouldn't be able to read it if it were. The good news is that these problems are mostly things you can experiment and dial your machine in on a per spool basis. The bad news is that you pretty much need to. And that's before you start looking into factors like air pockets, out of round or just poorly sized filament. It's a surprisingly hard problem to make it right and consistent. Pockets will lead to bad prints and sputtering. Newer sprung extruder designs tolerate poorly sized or shaped filament, but many older designs just choke and stop when the filament gets too thin for a good grip. Color also has a noticeable influence. In many ways PLA has been a boon here, as it's just on kind of monomer. Colorant can still gently caress it up though. I'd buy from Makerbot, Makergear or Ultimachine. They're all known for high quality and consistent filament. There are other good places, but read up on them first.
|
|
#
?
May 1, 2012 07:27
|
|
|
One colour of ABS that I've run into troubles with is MakerBot's first batch of glow-in-the-dark ABS. It glows just fine, but I've found that printing with it is a bit of a challenge. It doesn't adhere to the build surface as well as other colours that I've used, and the end product is almost crumble-y in thin areas. It also has a very different texture.
|
|
#
?
May 1, 2012 07:52
|
|
|
Printed a great 3D scan by Artec on the weekend: More photos here: http://www.techknight.com/blog/2012/05/01/printing-artec-birth-of-pegasus-scan/ The model was originally uploaded a couple of months ago as a single piece, so nobody printed it until Zomboe sliced it up on Thingiverse. 
Snackmar fucked around with this message at 01:42 on May 2, 2012 |
|
#
?
May 2, 2012 01:40
|
|
|
Got my very first 3d printed objects in the mail today.  Replacement throttle handles for an old airplane. One had broken off so I figured why not make some fancy new ones. Didn't take long to get from Eindhoven to here from shapeways.
|
|
#
?
May 9, 2012 03:05
|
|
|
helno posted:Got my very first 3d printed objects in the mail today. Do you have some pics of the handles installed? I'm having trouble picturing them in use. Also, which tools did you use to create the model?
|
|
#
?
May 9, 2012 18:02
|
|
|
I'll have some pictures later tonight once they are installed. They have a slot in the thin base part that fits over the existing metal from the lever. My uncle does alot of work in solidworks and that was the result of about an hour of basic instruction from him over skype. It is amazing how much of a better program it is than autocad. Edit: Pictures. Problem  Solution 
helno fucked around with this message at 03:00 on May 10, 2012 |
|
#
?
May 9, 2012 21:52
|
|
|
There really is no comparison with parametric modeling programs like Pro/E, SolidWorks, or CATIA. I would be all over this if licenses weren't so drat expensive, I love doing solid modeling  E: Does anyone have a link to that professional multi-material printer? It was intended for small scale industrial use, not really home consumers, but I can't seem to find it again. They had a really slick video demonstrating the assembly with movable parts and flexible gaskets and such.
|
|
#
?
May 10, 2012 15:01
|
|
|
DarkHorse posted:E: Does anyone have a link to that professional multi-material printer? It was intended for small scale industrial use, not really home consumers, but I can't seem to find it again. They had a really slick video demonstrating the assembly with movable parts and flexible gaskets and such. Are you thinking of Objet's printers? I wrote a bit about them and embedded one of their demo vids here last year: http://blog.ponoko.com/2011/09/08/objets-giant-multi-material-3d-printed-toddler/
|
|
#
?
May 10, 2012 15:50
|
|
|
helno posted:I'll have some pictures later tonight once they are installed. Ok, see, I was confused because I wrongly assumed this was a model airplane  Obviously, it makes perfect sense now.However, I came here to bitch about Junior Veloso: Junior Veloso posted:Hi Guys, Link to the article Maybe someone here can explain the difference to me but it seems like most of these 'pros' are totally moot. 1. Most open source slicing software generates easily collapsible support structures (e.g. Cura). 2. I've never owned a laptop or computer in the last 8+ years that couldn't handle dual video output. Even so, I don't think a product targeted at the hobbyist community should have dependencies on potentially expensive proprietary controllers when a practical and *cheap* alternative exists. 3. Ultimaker z-axis can (technically) achieve sub-micron resolution Granted, Cura probably isn't currently capable of driving an SLA printer but if there was a reasonably priced, open-source SLA printer available I'd bet a cup of coffee that Daid or the Skeinforge crew would add support. I had such high hopes, why is he doing it wrong? 
|
|
#
?
May 10, 2012 15:52
|
|
|
kafkasgoldfish posted:2. I've never owned a laptop or computer in the last 8+ years that couldn't handle dual video output. Even so, I don't think a product targeted at the hobbyist community should have dependencies on potentially expensive proprietary controllers when a practical and *cheap* alternative exists. Honestly I like the idea that the electronics generate a VGA signal directly and I'm therefore not looping a laptop or something into the workflow, but I'm not looking to buy one either so v  v
|
|
#
?
May 10, 2012 17:14
|
|
|
Oh god oh god oh god Another resin based printer, and this one looks legit, professional, and awesome... http://www.kickstarter.com/projects/b9creations/b9creator-a-high-resolution-3d-printer I'm really considering it...
|
|
#
?
May 10, 2012 17:26
|
|
|
That does. It looks really professional and worked out. I love seeing kickstarters that are "We designed and made it all and it's working, we just need to raise money to enable us to go into production." After all there are things sweat equity just can't get you through.
|
|
#
?
May 10, 2012 19:42
|
|
|
My Rhythmic Crotch posted:Oh god oh god oh god And open source. $2400. Hmmm....
|
|
#
?
May 10, 2012 20:56
|
|
|
What organs do I have two of?
|
|
#
?
May 10, 2012 21:23
|
|
|
The problem for me is that right now I live outside the US, so I will have to pay $2700 + import taxes. loving ouch.
|
|
#
?
May 10, 2012 21:44
|
|
|
What does it count as for importation?
|
|
#
?
May 10, 2012 22:02
|
|
|
My Rhythmic Crotch posted:Oh god oh god oh god And this is EXACTLY what Junior should have done if he wanted to actually make any money from his labor. This guys seems to have a really sharp looking product, good resolution, and high accuracy. He also seems to really have his bases covered, and the asking price gets either a 'some assembly required' or 'working out of the box' product to your door. Further he did not get his head so inflated by his work that he thinks that software by an unrecognized single individual with no commitment to open source is worth money.
|
|
#
?
May 10, 2012 22:10
|
|
|
Splizwarf posted:What does it count as for importation?
|
|
#
?
May 10, 2012 22:48
|
|
|
Linux Assassin posted:And this is EXACTLY what Junior should have done if he wanted to actually make any money from his labor. This guys seems to have a really sharp looking product, good resolution, and high accuracy. He also seems to really have his bases covered, and the asking price gets either a 'some assembly required' or 'working out of the box' Signed up for kickstarter just to support it, holy poo poo. I'll never be able to justify one at that cost, but everything you said is bang on. This guy. This loving guy.  Edit : Fully funded. He was getting basically 2k an hour for as long as I've been watching. Good for him. Same Great Paste fucked around with this message at 02:51 on May 11, 2012 |
|
#
?
May 11, 2012 00:57
|
|
|
I wonder if Junior checks it out and thinks  What the gently caress, man?!?Riding my coattails  Or whether he thinks "poo poo, I'm going about this all wrong."
|
|
#
?
May 11, 2012 04:57
|
|
|
Mister Sinewave posted:I wonder if Junior checks it out and thinks Likely the former, unfortunately.
|
|
#
?
May 11, 2012 05:07
|
|
|
Actually he seemed to take credit for inspiring the B9Creator guy:Junior Veloso posted:Since I created the blog I knew that a lot people would be working in similar project and many of them would create a printer or kit. I think this is great because our project has inspired some other people.
|
|
#
?
May 11, 2012 09:22
|
|
|
Is he under the impression he invented the concept?
|
|
#
?
May 11, 2012 10:21
|
|
|
I just want to interject that whether he does or not, taking something from idea to working prototype takes a lot of work, and even more after that to take it beyond. There is that. Amanda Wozniak said something that I thought was very insightful and concise: "When you have something working, you are 15% done and the fun part is over." I encounter people all the time who basically figure that all you need is the one brilliant game-changer idea and then somehow coast the rest of the way to the bank. Usually these people jealously guard their ideas and never get specific because they are terrified of someone stealing their idea (and in the end their idea sometimes boils down to basically "I have the next Facebook killer - I just need someone to program it!") But ideas are really not the hard part. Veloso kind of raises some of those flags for me, but he does have a working system - just what seems like poor management. How much time has been wasted trying to guard concepts and build details that can't really be protected and don't matter much anyway? Could he have been where the B9Creator guy is a year ago?
|
|
#
?
May 11, 2012 14:51
|
|
|
My Rhythmic Crotch posted:Oh god oh god oh god Yesyesyesyes! So wonderful to see someone picking up the slack that Junior has made over the past two years. Also this dude seems really cool, AND the fact that he's open sourcing everything is just awesome. I wonder if those resins can be lost wax cast...
|
|
#
?
May 12, 2012 14:35
|
|
|
For the resin machines, what exactly is limiting the resolution of the print?
|
|
#
?
May 12, 2012 14:41
|
|
|
InternetJunky posted:For the resin machines, what exactly is limiting the resolution of the print? Someone correct me if i'm wrong but I think it's the resolution of the projector in X and Y and then the stepping of the build platform in Z?
|
|
#
?
May 12, 2012 14:47
|
|
|
Penetration depth of the UV into the resin probably has an effect too.
|
|
#
?
May 12, 2012 14:49
|
|
|
Actually a bunch of things limit the resolution: 1- Penetration depth (how far does the blast of UV light go into the resin) 2- Stepper accuracy (how tight is the movement on the Z axis) 3- Projector resolution (how fine is the projected image) 4- Signal viability (is there enough UV light in a line of X size to activate the resin) 5- Scatter (how much UV light gets scattered into the resin beside the points that you are illuminating) 6- Strength (how strong is the resin immediately after exposure; if the mere act of moving the setting resin at 20 microns would warp or break it, then even though the projector, Z axis, and all other factors would let you do 20 micron, you can't REALLY do 20 micron accuracy because it would be warped before it set). That said, looking at his prints, I think he may be being quite conservative with his measures and I bet that someone tweaking could get even higher accuracy.
|
|
#
?
May 12, 2012 16:53
|
|
|
CAD: what are people using? I looked into a solidworks license but price  , I use sketchup but it doesn't seem powerful enough for printer cad.
|
|
#
?
May 25, 2012 11:05
|
|
|
Blender http://www.blender.org/ and Hexagon http://www.daz3d.com/products/hexagon/hexagon-what-is-hexagon are free if you're up to it.
|
|
#
?
May 25, 2012 13:37
|
|
|
There's FreeCAD which I've never used but seems to be a decent 3d modeling cad program. There's OpenSCAD which lots of people use to create parametric items, but is less of a 3d modeling program, and more of a series of scripts to make a 3d model. Because of this, there's quite a learning curve. Google Sketchup is actually pretty decent. There are some file conversion issues, but if you already know it, it's ok. Art of illusion is one that I've seen many people use, but it's not really a cad program. It's very popular due to its short learning curve. The reprap wiki has a pretty decent summary page about various software packages. It also links some other pages about using that particular software package for use with a printer.
|
|
#
?
May 25, 2012 17:03
|
|
|
Don't forget Tinker CAD (web based, free) and Alibre Design Personal Edition ($200)
|
|
#
?
May 25, 2012 17:53
|
|
|
I use Alibre at work and like it very much. Definitely worth the money. I was only a mild SolidWorks user before, but Alibre is a close enough clone that the learning curve was tiny.
|
|
#
?
May 25, 2012 18:13
|
|
|
kafkasgoldfish posted:Don't forget Tinker CAD (web based, free) If he thinks Sketchup isn't powerful enough, Tinker CAD is definitely not going to be satisfasctory. If you think Sketchup is too complex and difficult to use, then Tinker CAD is awesome.
|
|
#
?
May 25, 2012 19:04
|
|
|
Cakefool posted:CAD: what are people using? I looked into a solidworks license but price Autodesk's 123D (free) is nice. It's designed specifically for digital fabrication projects.
|
|
#
?
May 25, 2012 23:37
|
|
|
techknight posted:Autodesk's 123D (free) is nice. It's designed specifically for digital fabrication projects. oh sweet, they finally released the windows version. It was mac only last time. I have Alibre now but it frustrates me at times. I wish I could get Solidworks, it looks 100 times better. Not sure why they don't offer a personal edition, I'll never shell out $1400-3000 for it but I might spend $400. It seems to me that $400 is better than $0.
|
|
#
?
May 26, 2012 00:48
|
|
|
|
| # ? May 20, 2024 10:31 |
|
|
Checkout Inventor Fusion, its free at the moment and supremely badass. its as easy as sketchup, but allows for parametrics like openscad.
|
|
#
?
May 27, 2012 04:01
|
|