A collection of trays for storing both standard and deep 3/8 ths sockets with pockets for installing 3x10mm magnets which are readily available on Amazon and elsewhere. no need to pause prints, simply insert the magnet(s) after printing and plug them with the provided plugs.

These don't need to be strong. I print with 3-5% infill Depending upon the magnets you choose, these are strong enough to stay in place without issue, but if you want to tie the various groups together like I do, a simple dot of CA wicked into mating surfaces allows you to create pallets of sockets.