VDX Wrote: ------------------------------------------------------- > So this discussion will start anew, when the > mechanical stability of a 'printed' object will > overcome the 'only plastic' state And when it does, I'll still be there to remind people that milling machines have been available at their neighborhood Harbor Freight store for years and are able to produce much better fby Have Blue - General
Have you looked at using ifeelbeta's recipe?by Have Blue - General
Interesting - have any of these companies looked into having the trucks forged? Machining from bar stock is certainly better than casting, but forging is better yet, as the grain of the metal gets aligned to the shape of the part itself.by Have Blue - General
aduy Wrote: ------------------------------------------------------- > you cant even make skateboard trucks from plastic, > what makes someone think a plastic gun could work. I'm sure you can make skateboard trucks from plastic - they'll probably work, but just as with a fully printed plastic gun, they probably won't work very well. Consider the printed gun to be an analogue of the concretby Have Blue - General
Annirak Wrote: ------------------------------------------------------- > I think the problem is resolution. If you're > willing to accept a two-stage manufacturing > process, with additive machining (MIG welding in > electron beam mode) followed by subtractive > machining (CNC milling), there's a lot of > possibility to this. That's precisely what Sciaky is doing:by Have Blue - General
Buytaert Wrote: ------------------------------------------------------- > Mataerial > It seem like the material solidified instantly > when it cool down. It 'seems' like it because the video is significantly sped up :-) But yes, you're looking for a thermoset - the one in the video appears to have a foaming agent mixed in as well.by Have Blue - General
It's not all based on budget - a lot of it comes down to certain things still being protected by patents.by Have Blue - General
This sounds interesting, but not $28 interesting :-) "Study of the Technical Feasibility and Design of a Mini Head Screw Extruder Applied to Filament Deposition in Desktop 3-D Printer"by Have Blue - Plastic Extruder Working Group
Note that limonene will attack the ABS as well as the HIPS, just not as quickly (HIPS is basically the 'S' and 'B' of ABS). It's really best to use the HIPS as a breakaway support and then try to dissolve any remnants selectively. I think using PLA as a support material is much better if solubility is desired.by Have Blue - General
They used a Tin-Bismuth alloy - 492183 is very much correct about surface tension being an issue. Note how the corners of the square print become more rounded on the upper layers.by Have Blue - General
valerenga Wrote: ------------------------------------------------------- > But my question was more if people have > print-tested such 3D designs Yes, a friend and I successfully tested the Liberator design printed on his Lulzbot: Most of the failures of the design have been due to using incorrect ammunition (9mm in the Finnish test done by a media outlet, which is much too high pressurby Have Blue - General
Barrel out of a soap bar is an excellent response. Based on my testing with another engineer, the Liberator is a lousy gun. But it wasn't designed to be good, it was designed to prove a point and to ignite discussion on what it means when the promise of 3D printing is fulfilled and people are given the ability to truly create anything. I see it like this - people concerned about being able toby Have Blue - General
uGen, the additive lathe technique for using a fiber loaded polymer is quite clever - I can see a lot of applications for piping and other pressure vessel work (like the Ultem airduct that Solid Concepts made: ) I got to chat a little bit with Scott Crump of Stratasys the other day about materials and asked him about fiber reinforced polymers. Nozzle erosion is a minor issue (the big industrialby Have Blue - General
Ohmarinus, the discussion is about the Stratasys uPrint, and not the PP3DP Up! printer - two very different animals! Hugo1a, the EEPROM used in the uPrint (and HP branded versions thereof) is MAC protected. Unlike the EEPROMS used in the various P-class machines, you can't re-write the uPrint cartridge EEPROM without knowing the encryption key. The 3DS Cube uses the same MAC protected EEPROM (by Have Blue - General
Links have been fixed, thanks! I actually may have a spare controller board - let me know if yours winds up being unrepairable.by Have Blue - General
Someone actually gutted the electronics of a Dimension machine and replaced them with an open source system, so a full retrofit can be done (though they didn't keep the heated chamber): The file that gets sent to an FDM series machine is Asymtek's ACL - it's not G-code, but operates in much the same way, with a lot of move commands. Here's an example:by Have Blue - General
Not a stupid idea at all! I hope to try epoxy fills of sparsely printed parts myself soon. And there is an epoxy product already on the market specifically for strengthening porous 3D printed parts: zelogik Wrote: ------------------------------------------------------- > Ok, so stupid idea, I can remove from my head :-D > > Thanks you!by Have Blue - General
aduy Wrote: ------------------------------------------------------- > just make an extruder that can spit out kevlar and > cut it. You need a spinneret to create aramid fiber, which would then need to be gathered, woven, and layered for ballistic protection - not something feasible anytime soon via 3D printing, especially since the polymer solvent used for spinning is pure sulfuric acid...by Have Blue - General
Actually, I've pondered that a bit, and it may actually be an excellent application for 3D printing, especially given the per-user customization available. HDPE is used in many ballistic plates - it's bulkier than ceramic plates, but much lighter. ShadowRam Wrote: ------------------------------------------------------- > Someone should respond to this 3D Printed gun mess > with a 3D Prinby Have Blue - General
matty2013 Wrote: ------------------------------------------------------- > A plastic rifled barrel would be pointless, in a > real rifled barrel the grooves are the same(and > harder than the lead) material as the barrel and > they actually create grooves in the lead > bullet(the softer material) as it travels down the > barrel. > In a plastic rifled barrel the lead is the hby Have Blue - General
Unfortunately, 'Great Stuff' and castable foams have too variable a pore size to make for a good printer base.by Have Blue - General
SheldonE Wrote: ------------------------------------------------------- > Actually, I think an air powered soda can cannon > would be pretty lethal. Maybe they should ban all > plumbing supplies too. Certainly more lethal than the Liberator - a very simple spud gun can put out 400 Joules of muzzle energy, while I calculated the Liberator to be more like 66. And you can grow your own aby Have Blue - General
bobc Wrote: ------------------------------------------------------- > Have Blue Wrote: > > Well, I share the same worry. A number of > years > > ago, legislators in the UK were seriously > > considering regulating and banning private > > ownership of lathes because they could be used > to > > make guns. > > I don't believe that. Do you have any ciby Have Blue - General
He hasn't tried any higher density foam - if we can find some, we'll give it a shot, though! The nice thing about the PIR is that it's cheap and readily available. A denser tooling foam is going to be more expensive and not nearly as easy to find locally.by Have Blue - General
Dark Alchemist Wrote: ------------------------------------------------------- > Fact is I know I am not afraid of what you do but > I am afraid of what the govt is going to do > because you can do it. Well, I share the same worry. A number of years ago, legislators in the UK were seriously considering regulating and banning private ownership of lathes because they could be used to makeby Have Blue - General
Dark Alchemist Wrote: ------------------------------------------------------- > True, but a smooth bore does make it very hard to > trace the bullet back to that weapon if all > weapons were smooth bore. Besides, and I am not > 100% sure on this, but isn't the main reason for > the spiral carved bore to help the bullet to spin > instead of being tossed out of the weapon? Youby Have Blue - General
The foam gets damaged a little, but you can keep reusing it. My Stratasys foam bases loook pretty rough after a while, but since you're intentionally burying the tip by perhaps 1mm into the foam for the first few raft layers, it really doesn't matter. A suitable square of foam for a large printer bed cut from PIR sheet is only about 50 cents of material, and you can flip it over and use the othby Have Blue - General
SheldonE Wrote: ------------------------------------------------------- > I was thinking something more along the lines of > "We don't support the use of 3d printers to > promote violence". I certainly don't. But I see nothing wrong with applying 3D printing to my hobby of gunsmithing (though some on this thread seem to be abhorred by the idea).by Have Blue - General
I took the foam base out of one of my Stratasys machines and gave it to a friend to try on his MegaMax, and the results were excellent (it was a 4# density polyurethane foam board - Last-A-Foam FR-7104, to be exact). He's now been experimenting with printing on the foil-sided PIR foam sheets you can get at the home improvement store with excellent results (after removing the foil, of course). Iby Have Blue - General
aduy Wrote: ------------------------------------------------------- > no the point is there is a law prohibiting pistols > to have a smooth bore, because it makes it very > difficult for the forensics team to trace back the > grooves in the bullet back to a specific gun if > there are no grooves in the bullet. A quaint idea, but entirely false. The AOW classification that would cby Have Blue - General