A Dremel bit holder that has a tray to hold sandpaper bands and 9 slots to hold sanding drums or any other type of bit. Included the STEP file so that you can remix it as needed.
I also have a included a version that has two magnets (12 mm diameter, 3 mm thickness) enclosed within the tray to hold screws, nails, or whatever small metal objects you have lying around your workspace. If using the version with magnets, it is IMPORTANT to pause the print before layer 4.25 to insert the magnets. You can do this in gcode with the command "M1", after which it will pause indefinitely until you resume the print. This is not necessary for the version that does not have the magnet holes.