This is a stripped-down remix of the fantastic battery adapter by Sunookitsune - thanks for including the STEP & Fusion project files!

This part is intended to be attached to a thick board (2x4" or similar) with large holes drilled for the battery stems to recess into. You'll still need a couple washers or spacers with a 2x4, since the battery stem is just a couple mm taller

This allows batteries to be clipped in horizontally against a wall, or the underside of a shelf.