[Blabber] DLP based UV photopolymer 3D printer

Guan Yang guan at yang.dk
Mon Mar 12 15:31:51 EDT 2012


I've also read that photopolymer based prints are typically less strong than extruded ones. (Or was it the other way around?)



On Monday, March 12, 2012 at 15:07 , Peter Shenkin wrote:

> Hi,
> 
> I'm having trouble grokking the diagram. When the UV light shines through the vat of polymer, why doesn't the whole vat polymerize, rather than just the layer in contact with the growing object being raised from the vat?
> 
> I seem to recall that the original stereolithography devices that started appearing in the '80s held the stage just below the surface of the liquid. The UV laser was focused from above, and polymerized just the thin layer at the top. Then the stage would lower a bit into the vat, exposing a new thin layer of liquid polymer at the top, which would then be polymerized by the action of the laser, and so on. 
> 
> That is my recollection. I am guessing that the design in the link is correct, and there is something I am missing. If anyone can (ahem) illuminate the way the depicted design works, please speak up. 
> 
> In any event, the ability to actually do STL (STereoLithography) would be a great advance, in both resolution and capability, over the Makerbot and RepRap machines -- not only from the point of view of resolution, but also because overhang is rarely, if ever, a problem that one has to design around. For instance, my iPod wire manager (http://www.thingiverse.com/thing:16564) could be printed as a single piece on such a device -- or at least, the type of device I recall. (Until I understand this design better, I'm not sure the same advantage accrues.) 
> 
> Also, at $40 a liter, building an object is going to cost quite a bit more than devices that melt and extrude a thread of polymer, particularly if one cannot save the unpolymerized liquid for later use. 
> 
> -P.
> 
> On Mon, Mar 12, 2012 at 2:28 PM, Guan Yang <guan at yang.dk (mailto:guan at yang.dk)> wrote:
> > We need to build one of these!
> > 
> > http://code.google.com/p/lemoncurry/wiki/main
> > 
> > 
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