i made 2 versions of a 18650 battery holder grid tray one for 20 (4x5) one for 36 (6x6) batteries both of them are also are split in A and B models if you want to print it in 2 colors to seperate loaded and unloaded cells.
There is also a single cell file if you want to make your own size
They also work on top so you print a extra tray to cover your batteries
They will probaply produce quite a bit of stringing on the upper part but it's easy to remove for me it wasn't an issue maybe i'll fix it one day
The author marked this model as their own original creation.