Post-Apocalyptic Calculator Aka. Abacus

You need to do you taxes, even when the world is ending...

Print instructions

Print the following:
3 x Thick Beam
10 x Thin Beam
1 x Side Frame
1 x Side Frame mirrored via prusa slicer.
100 x Counter

If you want an easier assembly then use "larger holes" version of side frame, though this might require super glue during assembly.