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I built two gigantic laser cutters from the Lasersaur BOM and my wife and I run a profitable home business , making model ships and buildings that we sell to tabletop gamers (mostly through Kickstarter):
But we want to diversify into 3D printing to make things that we can't make on a laser cutter.
I played a bit with plastic deposition 3D printers and concluded that they are terminally S-L-O-W and there isn't much out there that shows promise to make them go any faster. Using a laser to cure resin suffers from the same fundamental problem that they go slower as the build area increases and there doesn't seem to be a way to drastically speed them up either.
Using a video projector offers the possibility to go fast because it exposes the whole bed in parallel. So this stuff is exciting to me. But still, the speed goes down as the build area goes up...but at least this approach offers the best chance to make things faster by brute force increases in the amount of energy we can apply.
So it seems to me that we could possibly, finally, build a 3D printer that's fast enough to manufacture stuff profitably.
The need for more energy at the bed suggsets that I need either a single projector that puts out more power, or projectors that are cheap enough that I can have lots of them.
Everyone seems to be talking about the Acer H6510BD as the sweet-spot of power versus cost. With that in mind, how do I get more watts-per-dollar?
* Can I buy a more expensive projector and get more power per dollar?
* Can I buy a bunch of smaller projectors, each with better power per dollar?
* Everyone says that the great thing about the Acer is that it puts out enough power to cure resin without modification...so if I *do* modify it, can I get more power?
Thanks in advance!
-- Steve
Statistics: Posted by Steve Baker — Sun Mar 08, 2015 1:12 pm
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You can use multiple beamers for twice the build area.
I remember seeing a commercial DLP printer that supported 2 projectors for 384x216mm build area, but can't find it anymore
Statistics: Posted by Zenon — Sun Mar 08, 2015 5:14 am
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But it occurs to me that the intensity of the light I'll get from a projector at any given point on the bed would be inversely proportional to the area of the bed I'm shining it onto.
Would I be correct in assuming that the resin curing time is directly proportional to the incident light intensity? Or is there some kind of non-linear relationship?
I wonder whether using the same kind of projector and increasing the bed size will improve my production rate?
Statistics: Posted by Steve Baker — Sat Mar 07, 2015 10:08 pm
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For example mentioned Acer has 3000 lumens and minimum pic diagonal of 45''.
With 16:9 it will give pic area of ~5400 cm2, so it will have a luminance of 5.5 klux.
Having smaller mini-projector with minimum pic diagonal of 5'' and let's say - 50 lumens will give me luminance of 7.5 klux.
It means that simpler and lightweight mini-projector is better than those bright powerhorses.
Is my thinking right?
Statistics: Posted by fenriss — Fri Jan 02, 2015 1:34 pm
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