I found these great mouse ears, but the mesh was not of great quality, which makes it hard to easily edit or slice. Thus, I imported the mesh into FreeCAD and reverse-engineered it into a parametric model. Modify it as you please.
They do have magnet holes. Printables just doesn't render them right. They will show up in the slicer.
Attribution to Original:
Star Ears byhackersis licensed under the Creative Commons - Attribution - Non-Commercial license.
See original here
Updated 4/8/2022: Fixed a magnet hole that was too small. I had forgotten to set any diameter at all.
Category: Accessories
The author marked this model as their own original creation. Imported from Thingiverse.