18650 modular system - optimized for FDM printing

This is a remix of the 18650 modular system by yoda_cz. The original design was created for printing with a resin printer. I have adapted it so that it can be printed with an FDM printer without the use of support material. I changed the thread and some overhangs for this. The modules for Micro-USB and USB-C from the original design are not included here as I did not modify them.