4x AA battery holder / case
thingiverse
Sure... You can buy this thing for 76 euro cents at ALiExpress but hey... we'r makers so I designed this classic one which fits by the way in my OTTO robot. For the + contacts I used 4 pushpins (which you can push through the holes with a hot solder iron) and for the - some springs I had laying around and Hot Glued them in to the little rings to center them. I assume you can figure out the rest yourself? Have fun!
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