Thoughts on the resin chamber;
light proof or uv proof min
simple interior I don't want resin able to harden anywhere critical
Must be resistant to salt water and plastic resins, I suspect this leaves stainless steel, glass (crock pot?), aluminum will oxide passivate so it will eventually stabilize in the salt water.
a method of managing resin level... like maybe the way a teapot is built with a narrow tube from the bottom, or since ardiuno can be a laser scanner build a rangefinder in to check the arbitrary level of resin.
a build platform with holes so resin can can flow through/around as the platform indexes maybe a chicken wire mesh
I think knowing exactly where the surface is isn't that important as long as its focused for the first pass. if I build a raft or support structure of some arbitrary height and start with an over cure then every pass after the over cure will be of a known z motion and the actual height could be calculated from cure volume shrinkage - z strut support structure displacement.
Haven't decided how to place the z screw for the platform but it will be outside the tank. some stability considerations... I should think about that more
I'm going to turn a DLP projector into a 3d rapid prototyping machine, and show you how along the way. The final goal is a complete diy guide.
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