Here are 3D parts we have designed for microscopes. Most have been designed in either Solidworks or Autocad Inventor (which can be obtained free for academic use).
These are stage inserts with the same footprint as a standard 96-well plate, so they will sit in any 96-well plate holder.
These are stage inserts designed to sit in the 96-well plate holder insert for the Nikon Ti Stage.
These are parts for a correction collar that clamps on to a Nikon 40x / 1.15 WI objective and allows the collar to be driven by a servo motor.