I designed these to protect spare batteries I carry in my rucksack. My headtorches use 3 x AAA and my gps uses 2 x AA. I also need 4 x AA for my camera flash batteries.
They have a smooth outer profile so I can seal them with a bit of bicycle inner tube and they also have a tab to help prevent the lid coming off.
This is a work in progress:
17/07/2019 - first print of the AAAx3 and the fit of the lid on the base is a bit baggy. I'm doing another print with a different filament to see if thats the problem and then will adjust the design to suit.
The lock tab needs to beef up a bit and I need to adjust the ribs slightly to help them print better
Fusion 360 links
AAAx3 - https://a360.co/32wMp94
AAx2 - https://a360.co/2XMlgjB
AAx4 - https://a360.co/2jQxMMf