I am planning to build one of these & wanted to layout out all the parts and a table in openscad to see what kind of problems I might have before ordering any parts. My 1st question is how the Stop_Block.stl works. I am guessing it stays in the same place relative to the Z_XY_Center.STL since it is clamped to the belt. I attached a couple of screen captures of how I am laying this out. Let me know if I have anything wrong so far.