This is a handy case for storing your GoPro Hero4 batteries (I tried it with brand GoPro and Wasabi). You can insert them upside down to mark when they are uncharged. You should push them from below to pop them out. Useful for multicamera rigs. If you need more than four slots, print two cases!
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You can also check this in Thingiverse and Shapeways. Feel free to download and print! Find below a couple of prototypes.
