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Handy parametric battery boxes from ffleurey on Thingiverse:

This is a remix of flummer’s battery box in order to use different battery contacts. The contacts I am using are available here for a quite reasonable price: http://www.banggood.com/10-Pairs-Silver-Tone-Metal-Battery-Spring-Plate-Set-for-AA-AAA-Batteries-p-1046111.html