UNTESTED AS i HAVEN'T GOTTEN MAGNETS TEST WITH YET
As Like many others I saw the wyrmwood kickstarter and felt like making my own version of their organizer trays. (And then after some suggestions I made a version to use 5mm magnets)
All pieces print without supports, and you'll need 1 base, 3 legs and a top for each tray.
Then you'll also need a cork coaster and 6 5mm diameter spherical magnets... Everything just then snaps together.
Unlike my other version, these should stack no matter how the legs are arranged, as the magnets should swivel as required.
AMAZON APPARENTLY SHIPS RANDOM SIZED COASTERS FROM THIS LINK SO IF YOU'RE UNLUCKY THEY'LL BE 4" DIAMETER
Coasters (90mm diameter, 3.2mm thick) for bottom: https://www.amazon.com/gp/product/B075TGD8XM
Magnets (5mm diameter spherical): https://www.amazon.com/gp/product/B07KXM8M68
The included cork model is for if you want to try printing the coaster portion yourself.
2019-04-30 Added a raised text version of the caster tile. Also added pdf printable templates for the cork size and the inside of the rolling tile if you want to line it with felt or something (print without scaling.)
2019-05-01 Added a revised base file with holes in the sides to allow the magnets to make physical contact as they are far weaker than the ones used in the disc magnet version.