stack-able 18660 battery holder

Stack-able 18mm cylindrical battery holder (for example for the 18650).
The model is made so that no support material is required.
I have tested the model with both repetier-host and prusa slicer.
First make a small batch of 4 just to make sure your printer can handle the overhang at such angles. Once proven you can commit to filling the print bed with them.