No supports needed, but you will have to poke out a single layer that I used for the inset m3 screw heads.

Requires Four M3x10 screws to hold it together.

This is a holder for those single 18650 holder and protection boards that also provide a UPS style 5V/12V boost circuit that one can find on AliExpress.

This design is for a board sized 89x22mm with an SMD battery holder.

Print instructions

0.4mm nozzle
0.2mm layer height
3 perimeters
20% infill