This magnetic fidget has four magnets measuring 6 x 2 mm. There is no cover for the magnets, and the hole is 2.5 mm deep. I chose this depth so the magnets don't protrude, allowing the fidget to move smoothly. The magnets are difficult to insert, therefore no glue is needed. You first have to push the magnets in a little by hand and then push them in completely with a pen or another stable object.

Have fun printing :)