I love Brian Dean's Embedded Magnet Dispenser, printed a bunch of them and stored them in a cup. But I always searched the right size and grabbed more than I wanted because of the magnets.

So I designed this little storage box to keep 10 different sizes in place. Perhaps it's useful for anyone …

It has 4 slots for 10, 8, 6 and 5 mm magnets and 2 slots for 4 and 3 mm magnets.

I used ABS, but PLA should also work fine. 

No support needed.