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Hey, excellent looking build George. Just got one running myself, same projector but went with nanoDLP on a raspberrypi3 and sparkfun easy driver in lieu of the arduino and stepstick. Just want to ask...did you mean 20 seconds per layer? or really 20 mins per layer? That would make for some terribly long builds...but it could make sense with the UV blocking filter still in. My layers are curing in ~4 seconds with white maker juice G+ I have some maker juice wax cast in the mail, excited to try some investment casting wax as well!