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General discussions. For specific printers / electronics / fabrication methods / softwares, please see other sections.
Re: peltier junction heated bed? - 14 years ago
100% Efficiency? Not for a Peltier... Electrical efficiency doesn't really tell you the whole story. Heat pumps have their own terminology - CP (sometimes COP) - coefficient of performance. Basically, how much heat (energy) does it take to move one unit of heat. If we ignore the environment, then it looks like efficiency is greater than unity - but without an environment, we don't have a heat pumby trebuchet03 - General
Re: cool componants up print - 14 years ago
In practice, their autofeeder isn't actually needed so long as you have a fairlead and spooled material. Some of their blog pictures show the machines being burned in without feed motors. I blew up my feeder mosfet and despite having repaired it, I continue to run without the autofeeder. I've run a few pounds of material without it and am convinced I don't need it - it also makes the machine a tby trebuchet03 - General
Re: 3D printers in the developing world - 14 years ago
Cefiar Wrote: ------------------------------------------------------- > trebuchet03 Wrote: > -------------------------------------------------- > ----- > > For cost - I'm not convinced that you'll be > able > > to beat many products on cost. > > > > 1. There's some interesting price economics for > > products - the price of a bike axle is X > > regby trebuchet03 - General
Re: 3D printers in the developing world - 14 years ago
I'm actually doing work in "frontier markets" Perhaps this perspective is useful... For 3D printers.... I see an opportunity for waste reduction. Not needing packaging for every single thing can help a lot. Every piece of clothing you're wearing came in it's own polyethylene bag. New product is the same way in every continent regardless of OECD rating of the country. For cost - I'm not convincby trebuchet03 - General
Re: Belts and pulleys affecting quality - 14 years ago
Agree with pretty much all points... The models posted by pp3dp are generally bigger - so the signal to noise ratio is favorable. I don't think they doubled the size (ref: cathedral playset) - but they def. used all of the 135mm build height. I wouldn't call it higher resolution... Instead, I would call it higher precision (from machine to machine). Removing the user from the assembly process hby trebuchet03 - General
Re: British Press: Typical. - 14 years ago
The "lack of X" isn't limited to British journalism Although, the lack of technical know how isn't limited to journalism... Dare I say, a majority of people don't have the technical aptitude. It's easier to make a devices that serves them than try and change humans to be able to make the device. I have a lack of Karaoke know how (really, singing/music making in general) - so I buy music insteaby trebuchet03 - General
Re: Getting skeinforge to print a shield like reprap-host - 14 years ago
This feels like watching a train wreck... Brian, I don't know you... But you posted this: >At this point, I am not actively selling anything and really have nothing to gain. (Probably nothing to lose, either.) If you have nothing to gain and nothing to lose... Don't waste cycles treading water and dividing your attention - focus effort into something that you have something to gain from. Tby trebuchet03 - General
Re: Makerbot water soluble filiment - 14 years ago
It's not just software - its the material too. MakerGear material doesn't work as well unless you turn down Up!'s temperature. Even after that, the support structures don't separate quite as nicely (better, but not as well as the OEM material). Allegedly, the material from reprapsource works well at stock temperature - but for me, the landed cost is more expensive than the cost of OEM materialby trebuchet03 - General
Re: Makerbot water soluble filiment - 14 years ago
brnrd, PVA is widely used as a film mold release... I've used it in a liquid form - sprayed it on to fiberglass molds, let it dry (into a super thin sheet film) and then laid up really big parts. If the part was stubborn to remove, water was used to dissolve the PVA and release was fairly easy. If you were to dissolve it in your hands, it makes a pretty sticky situation.by trebuchet03 - General
Re: 3D fabbers: don't let the DMCA stifle an innovative future - 15 years ago
I'll Drink to that! murrayd Wrote: ------------------------------------------------------- > Post your ideas somewhere public. Then they're > prior art, no longer novel and can't be patented > subsequently. In that case, the intellectual > property can't be appropriated.by trebuchet03 - General
Re: 3D fabbers: don't let the DMCA stifle an innovative future - 15 years ago
If my tone comes across as patronization - my apologies (text doesn't convey intonation, a problem :p). Imagine the text in front of a medow with "frolic-y" music playing in the background This is generally better conversation over beers than in text though (happen to be in the Bay Area?). > If you're half-smart, you don't fight a suit for patent infringement, you establish that a patent shoby trebuchet03 - General
Re: 3D fabbers: don't let the DMCA stifle an innovative future - 15 years ago
murrayd, I'm not saying a Poor man's patent is a patent either (it's just the colloquial term)... Only a patent is a patent and only a provisional gives you the ability to say "patent pending." Provisional's are cheap (less than $100 and you can file yourself, but they only last 12 months. From a legal stand point, mailing documentation to yourself does not satisfy any tests for prior art. Courby trebuchet03 - General
Re: 3D fabbers: don't let the DMCA stifle an innovative future - 15 years ago
murrayd Wrote: ------------------------------------------------------- ... > media you have access to, put it in an envelope, > post it to yourself, and copyright your media. > It's not such a big deal, but if a company uses > your idea to grab a patent that freezes everybody > out, your copyrighted record stands as what's > referred to as "prior art". If prior art exists, &by trebuchet03 - General
Re: 3D fabbers: don't let the DMCA stifle an innovative future - 15 years ago
dissidence Wrote: ------------------------------------------------------- > from what i know it will have to be pretty blatent > for them to get a notice over something, it would > have to have some sort of trademark on it. i have > cought a few talks that use the automotive sector > has a good example. and the just of it is that you > cant pretend to be some one else. that is mby trebuchet03 - General
Prusa Mendel - Missing Parts from GitHub - 15 years ago
I'm looking to print a Prusa mendel, but I'm having a hard time tracking down all of the parts... The printed parts list here: http://reprap.org/wiki/Prusa compared to the parts list on github (https://github.com/prusajr/PrusaMendel) has a few discrepencies. 1. y-idler - I grabbed it from the RepRap SVN, so I think we're good here 2. y-slider-better - completely missing from github, can't finby trebuchet03 - General
Re: Drilling 0.5mm Extruder Hole on a Lathe. - 15 years ago
I pecked it with a #00 center. The drill diameter is .64mm on a 00 IF you get beyond the center drill's lip. The goal of a center drill is to provide a place for the drill bit lip relief to fall into so they can't (ideally) wander. If you still have a small counter sink - part it off (or use whatever operation of your choosing to get your final shape). I'll second the comments about careful setby trebuchet03 - General