4x AA Battery holder - no springs - simple hardware
thingiverse
Simple Battery holder with hardware instead of springs. 4x M5 screw (min 3/4" for 2x, min 1/2" for other 2x) 1x piece of Steel Strapping (1/2" or similar) Simple print without supports 0.2mm to prevent bad overhang issues inside the curved roof bend strapping to lock in place after inserting. (Or just wrap wiring around the screws, your call). Designed for flexibility ... you can even pull voltage half way by using the intermediate screws (6V or 3V your call).
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