All the Pieces

The main adapter body and larger part of the rail are printed together. The clamp assembly includes two guide pins, and springs go around the 1/4-20 bolts used to clamp it. The carriage bolts press fit into the knobs and the clamp ring screws on outside to hold the lens tightly. Not shown is the internal ring for holding the filter, which is taken from the previous filter adapter.

All parts are printed as single pieces with no support required.