The original desiccant container seemed a little too large for me and it used a different magnet that I had on hand so I reduced the size and changed the holes to suit.
The desiccant beads I am using are from Amazon branded as "Dry & Dry" rechargeable premium orange silica gel desiccant beads (https://a.co/d/6c9rpcs).
Magnets were purchased off Aliexpress and seemed pretty common so you should be able to find them.
The printed end product functions fine aside from the cover surface faults. Magnets were sufficiently snug when inserted and worked well.
Notes
The author remixed this model.
I reduced the size of the original model and resized the magnet holes to fit 10mm x 4.5mm magnets.