"I'm not a historian, but by the shape of the "cup", I don't think it can act as a suction cup. The 1866 patent for the developing stick had a better shape that worked as a suction cup. It's probably just a softer material so you don't mark the surface."

"Would be interesting to find a second life for all this plexi, since it is PMMA it is recyclable, but for that it must go to a center. the best would be to do something useful .."