The file '18650 Battery Holders 3D Printer Model' is (123dx,stl) file type, size is 1.5MB.
These are a snug fit, If your battery's have nipples or you want a looser fit, feel free to adapt the 123dx files included.
I used these battery springs and tabs from eBay, they meant for aa's but i put support in bottom of holders and they work fine
https://www.ebay.co.uk/itm/263485815185
1_X_18650_holder.123dx | 175.4KB | |
1_X_18650_holder.stl | 1.9MB | |
2_X_18650_holder.123dx | 199.7KB | |
2_X_18650_holder.stl | 2.3MB | |
3_X_18650_holder.123dx | 234.6KB | |
3_X_18650_holder.stl | 2.4MB | |
4_X_18650_holder.123dx | 235.8KB | |
4_X_18650_holder.stl | 2.5MB |