18650 battery holder

Why use something off the shelf when you can make it yourself? This is a battery holder I designed to increase my odds of getting stopped at TSA, because it looks like a grenade. Ha ha, just kidding! I've never gotten any hassles about it going through security. This will hold 4 18650 batteries. The offset on holes is just right if your printer is decently tuned. If you're having problems, try scaling up the print just a few percent. I suppose PLA will work, but I prefer to use PETG. 

No supports are necessary, print the cap with the flat side on the bed.

Infill - doesn't really matter, 3 perimeters recommended