This design is a recreation of the stock battery box that was included with RC10 kits. It will fit the stock mounting holes on an RC10 chassis. Use a 4-40 tap to thread the mounting holes on top and bottom.

I also have a version of this design with the front notched out, for use with stick battery packs.

You may also want to use my top/strap. It has a modified keyhole to accommodate PLA material being less flexible than the original nylon.

Creality

Ender 3 Pro

No

No

.12mm

100%

When tapping the mounting holes, clean the cuttings from the tap frequently to avoid clogging the tap and fouling the holes.