A microscope adapter for M4/3s cameras, designed to fit a 23.2 mm eyepiece tube.
I printed mine in PETG. Diameter of the joiner is 23mm, so it should be an easy fit.
It's a modification of the M4/3s mount designed by Anthony Kouttron - https://grabcad.com/library/micro-four-thirds-lens-mount-1
If the camera shows a black screen, make sure that the hole for the lens securing pin is aligned and doesn't have any filament stuck in it.