A friend of mine criticised my previous revolver-like battery holder design (https://www.youmagine.com/designs/sealable-aa-battery-box) so I decided I will do a more minimalistic version for him.I also recorded the design process: https://vimeo.com/158792756 Since the first design I tuned some of the parameters so now the device holds the batteries securely and safely. The print with 0.2 mm layer height and 20% infill requires only ~7.5 g filament (which is ~920 mm from the 2.85 diameter version) it is ideal for leftover filament usage.Update: based on defuzz's request I made a second, subtitled screencast for easier understanding: https://vimeo.com/159033408