So you want to build an SLA printer? You’ve got two choices for UV light sources; a UV laser, often salvaged from a DVD player, that has to move on two axis to draw the layer patterns, or a projector that projects the whole layer at once.
A projector is faster (one layer at a time) and has fewer moving parts (no X or Y axis). However, projectors are expensive, and only DLP type projectors work without extensive modification. If you decide to use a projector for your printer design, make sure you’re getting a DLP. The other common types of projectors are LED and LCD, and while those might be modifiable to work, it won’t be as easy. Also, higher resolution printers mean higher resolution prints, so there is a real benefit to going the HD route.
KT421 Is Not At Her Post 