A handy little compartmented box for storing screws, washers or anything you like.
It latches closed and shouldn't come open accidentally, even if you drop it.
(Requires 6 M3x20mm screws for assembly.)
There are dividers top and bottom, to ensure things can't pass between compartments when the box is closed. This is a customized version of my "Customizable Rugged Waterproof Box":
This version uses the v-grove rather than an o-ring, so it is not fully waterproof but it should be well sealed against dust.
See the cross-section images for the correct hinge and latch assembly.
Here is a video of the latch operation:
(edit 2019/02/27: updated "hinge.stl" to correct model, it was previously a duplicate of "hinge_single_axis.stl")