Designed for a 12x3mm disc magnet.
Prints without supports. There is a pause at 4.25mm, when you need to insert the magnets.
Project file was created with 2.4.0. beta, so if you go with the .3mf, make sure the slicer can handle the “negative volume” part. (Prusa slicer 2.3.3 can't.)
The author remixed this model.