These are designed to use 6mm x 2mm disc magnets. They should be able to be press fit without the need for glue. However, if it is too tight I would recommend using a 15/64 or 1/4 in drill bit to widen out the holes a little bit.
Here is the link to the exact magnets that I used: https://a.co/d/8rdbSbF
They have been designed to work with multi-color printing. I printed mine on my Creality K1C with it's 0.4mm nozzle.
If you print your own please upload some photos, I would love them see them!
The author marked this model as their own original creation.