Build Your Own SLA/SLS

Hi, I made a quick drawing of what i mean by the inverted U, its metal with thin walls, as thin as possible, i made the walls from 0,3 mm steel. The wiper (recoater) is making a single forward or backward move after each illumination. This way the dent in the resin above the lowered object is filled...

I am using the top down system for a couple of months now with a inverted u as a wiper, the resin is cappilairy pulled into it and delivers resin to the lower areas that are created when the part is lowered 1 layer. Trick is to have the wiper not at resin level, but slightly above it , a few tenths ...