On Jul 27, 2012, at 10:10 AM, Jon Elson wrote: >> Not to mention no need for support material. >> > Not true. In fact, that is about the only drawback to the DLP system, > is there is no > way to make a model with a different (soluble) support material. There > are certainly > some models that have separable parts or gaps in the parts that could > use a support material. > Proper layout of the build can sometimes overcome this by building at an > angle.
Hi Jon, I guess i should have said that it requires less support material since the fluid is there to "support" the area as it is cured. In other words, each layer is buoyant - unlike the plastic extrusion printers. > The other drawback is the fixed number of pixels on the projector. A > guy in England > is working on using the spinning mirror from a laser printer, a powerful > blue diode > laser and a carriage to scan the raster down the vat to make a machine > that has high > resolution over a larger build area. His early tests look quite > promising. But, he > will have to develop custom electronics, probably using an FPGA, to modulate > the laser to produce the raster. (It is possible to gut a laser printer > and fudge the > myriad sensor inputs, but it might be a lot easier to just start from > scratch.) Yeah, the limited size is the main reason why I didn't consider funding the Kickstarter project. The build area at 100 microns is only 4x3 inches and only 2"x1.5" at 50 microns. Using an HD projector would of course increase that size to an almost practical size (still 8x6 inches is pretty small). But going that route, I would be better off just building my own so I don't pay for two projectors. Now if I did jewelry, the stock size would be much more suitable. I wonder about using 4 HD projectors or would optical distortion along the edges be a problem? That would allow a roughly 15.5"x11.6" build size at 100 microns. Best, Jeshua Lacock Founder/Engineer 3DTOPO Incorporated <http://3DTOPO.com> Phone: 208.462.4171 ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
