I saw a battery holder for AA and AAA batteries, but when I printed it the batteries kept getting stuck. So i designed my own, added 9V and C batteries.
The print is without any support, but with bridging.
By my experience it doesn't get stuck unless you fill more than 10-12 AA batteries at once, but who needs more than that?
Feel free to give some feedback!
Battery_storage.stl | 138.3KB |