Designed to fit 10mm x 2mm neodymium disk magnets. Space in the bottom for 4 of them, though you may not need that many.
Dimensions are 15cm x 9cm x 2cm with an internal slot of 14cm x 8cm x 1cm. Designed to fit the wipes I had on hand.
It should print up on its side without supports (opening slot facing up).
The author marked this model as their own original creation.