This model is a ring light adapter for Mitutoyo microscope objectives. It features a canal through which the power cables can be fitted and small pillars on which a which a diffusing paper can be glued. Note that in this version there are no holes in the ring for the LED power cables. I drilled the holes afterwards to tightly fit the cables, which then hold the LEDs in place (super-glue can be used to eliminate any looseness).

Printed successfully with PETG using a 0.4 mm nozzle and a layer height of 0.2 mm.

The model was created and can be edited in FreeCAD (FCStd file).