Space efficient parametric fit-all battery holder

2026/01/19 Version 8 Update:Added shell generation for the battery. (last photo)This shell is split into 4 parts for ease of printing. It's optional but when used can improve aesthetic, create flat surface for wiring / installing BMS and also add protection.--------------------2025/11/01 Update:Make spacing between cell customizable too. -------------------- Similar to my previous design this lithium-ion holder that can be easily customizable to fit battery of any sizes, but this time it's more space-efficient by arranging them into a honeycomb arrangement with only 0.8mm separation. Please note that because it's in a honeycomb arrangement, it's actually only more space-efficient in 1 direction, while the other will be longer by 0.5 cell diameter. You'll need to be bigger than a certain size for the trade off to be worth it so I don't recommend using this arrangement for small packs. You only need to changes these 3 parameters in the attached Fusion360 to genera