The holes are made with 10,1mm diameter, so no glue is needed for magnet installing (but recommended).
Magnet size: 3pcs - 10x10 round magnet (I used these)
Filament: PLA is fine
Notes: Two magnets should work just fine. Test that your magnets work correctly on the surface that you're about to install it on.
The author marked this model as their own original creation.