Simple top for a 1x1x0.5 Multibin insert. Holds 45 2.35mm shanked burrs. Similar to the existing Dremel bits lid, but that's too big (and this has more support for the thinner shanks, so less wobbling).

Aside - by designing the support section of this as a block, rather than a collection of thin wall tubes, this cut the print time by about 25% and uses less filament.