Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4710463.

Simple mount for a 40mm x 40mm laser module for a 3018 CNC machine. It slots into the gap where the bolt tightens the clamp around the spindle. Has several holes to allow you to vary the height as needed.
Print upright with support for the mounting holes but non needed for side vents. Printed with 4 top and bottom and 4 walls, 25% infill but not much of that. Fusion 360 file added if you want to modify it.