ring size measure tool

i see cards to achieve this, but individual items are way more easy to don and doff on any finger.

provided files can be printed and attached to a key ring to have a handy tool from 36 to 66 mm finger circumference or 11.4 to 21mm diameter. if these sizes do not match your needs feel free to export other sizes from the attached freecad-file.

no peculiar settings or material. pla works just fine out of a 0.4mm nozzle.

edit: the numbers are a bit more inset in the cad-file. orca-slicer did some weird things that made legibility worse on the bottom.