Basically there are two very common techniques for SLA printing : DLP and LASER. Personally I find it unfortunate to monopolize a beamer for a printer, so no DLP here. Laser? why not but it is complicated to implement, (and dangerous), so no laser.
What remains? A more recent technique is to use a nacked LCD panel as slide and UV LEDs to cure the resin. Hmm not bad! No overpriced equipment, possibility to recycle old screens, simple to implement... Ok! we'll go with that.
Single LED setup (small screen)
LED's array setup (medium/big screen)
SketchUp project : Download
Simple electronics based on an Arduino board with Grbl firmware.
- Slicer : http://lautr3k.github.io/SLAcer.js/
- Printer Controller : https://github.com/onlfait/uTopiaController