To create lithium battery packs of four. There is space in the middle for the spacers and also for the balancing scheme.
This is for standart 18650 cell.

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Layer heigts 0.15mm
Shell thickness 0.8mm
Bottom/Top yhickness 1.2mm
Fill density 15 - 30%
Print speed 50
print temperature 200 C
Bed temperature 60 C
Nozzle 0.4mm
Diameter 1.75