USD Coin Holder

Added singular .stl files and an everything .3mf file. The coin holders can be printed upright with supports to allow for the top to be printed. The caps took trial and error but they might not work correctly on a different printer. The holder base works as is with a .2 mm difference between coin holders and the base but a little sanding made the insertion easier. Within the everything file, a 2X object for each coin holder exists and allows for the expansion or reduction of height.