AB clip for LiPo batteries. These are the STL files for half of a clip of either the 3S, 4S, or 5S size clips. Both halves of a full clip are the same, and they just snap together on either side of the balance lead.
4/11/18 - V2, now with better fit and 3S/5S versions
I would use a very fine resolution for these as they're tiny and have lots of details. (17x17x8mm) On my printer I used 0.08mm z-resolution with a 0.4mm nozzle. It also helps with the overhangs for the snapping/clipping parts.
I also increased the infill % so that the hexagons inside would be to scale for these parts, since they're so small.