A tray I made to hold loose screws and parts during tinkering. Easy enough to write down "A - Screws inner controller ribbon" and "B - Screws outer shell" in a notebook or post-it nearby. The table I have it placed on is metal so the magnets hold the gadget a bit firmer in place, as well as holding the screws in place inside.
You have 9 bowls where 8 of them are labeled. If you are working on bigger projects with more loose parts you can use it as 4 big bowls instead. The middle bowl is intended as a "this is the screw i'm using right now"-temporary holding place. There's a slight lip on the rim of the bowls so screws/washers/nuts are easier to pick up.
I printed this with 0.2 but it's a bit rough in the bottom of the 'bowls', so I can suggest trying 0.16 or 0.12 if you want it smoother, but I have not tested it.
To print the model you will need:
I recommend printing a tester first to see if your printer can handle the tolerances:
The magnets used are ⌀10mm & 1.8mm thick. These will need a bit of force to push in. If you regret placing them and want them back, just use another magnet to pull it back.
The author hasn't provided the model origin yet.