Glow battery case

This design is to house a size D battery that I use as a glow start battery. 2 off M4x20 cap head bolts are secured with nuts so that when the case is screwed together, the heads of the bolts make the contact with the battery. I printed in PLA but see no reason why other filaments such as ABS could not be used. I Printed the two halves in red and black to help identify the positive/negative ends, which is clearly important if charging a rechargeable battery whilst still in the case.

Printed on a CR-10

Settings I used:-
0.4mm nozzle
0.2 layer height (A fine setting is needed to get a good print on the thread)
3dPrintz PLA Filament
Nozzle temp 220
Bed temp 60
Infill 15%