Remix ofReworks another design; the description credits the original.
What changed: Remixed in order to add magnets. Shortened the central column of models 5, 4, 3, and 2 so they can hold a 3mm height magnet (I used 5x3mm but you can use any width if you don't mind that the magnet sticks out) and created holes on the bottom of models 4, 3, 2, and 1 for 6x1mm magnets (mine came out a little narrower due to me printing at faster speeds to save time so i used 5x1mm magnets). 1 is the the tray that goes in first.
Glory to the original creator of the model!