Customizable box for ER 11 collets or similar

I recently bought a 15 pcs set of ER11 collets from Banggood for my spindle. They came in individual boxes all wrapped together in plastic film. Since I had to make a box for them I made it in Openscad so it can be easily modified for other uses.

I've printed this in PETG without supports, brims or rafts, with a 0.5 mm nozzle at 0.2 mm layer height without problems. The tolerance was a bit low and I had to file the lip of the lower part to make both parts join, so you might want to play w