Remix of 18650 x 4 top snap battery case screw tighteners for 12ga wire v7

Update: 7/21/17
Finally gave up on this system. Did not realize that PLA has too much flex. Should have printed in ABS or PETG. System failed and on inspection batteries had all come loose to the point I could remove them by hand. I had tightened them once before.

I am moving on to a professional battery. Printing with ABS would help. This system should work fine for low current applications. All the batteries were fine and held a good charge even when the controller would shut off under lo