Ver 1 Strong wall design great to keep batteries from shorting out or crushed, will also protect them from normal drops and hits.
Ver 2 Everything that Ver 1 will do but it allows for TPU printed inserts that further absorb shocks and vibrations. It greatly increases protection for the batteries.
Ver 2.1 Lid now has tabs on the side instead of solid wall to help shorten break in time. The lid will still be snug how ever this does decrease the amount of the break in as well as make it easier to use
I have a Canon remote Speedlite and the thing eats batteries like crazy so I keep an extra set of rechargeable AA batteries in my camera bag. I wanted a case to keep them from shorting out as well as keep them safe from drops as I have clumsy hands. Plus high capacity rechargeable batteries are more expensive as is the equipment they're going in so I want to keep the chances of them leaking / exploding as low as possible and that starts with taking good care of them by not busting them up from drops. The case has wide walls the whole way around the batteries including the top and bottom. The battery well and the case outer wall is a minimum 5.5mm apart, the case would have to be completely destroyed for the batteries to take a direct hit. Be sure to limit Infill to no more than 20% 'Grid' style as the honeycomb effect will help absorb very hard impacts.
If you print this and have the time, please upload a pic to the "I Made One" tab. I love seeing my designs get printed :) Thanks!
1.2mm wall thickness for strength, printed fine at .2 layer height but .1 will smooth out the top rounded edge more. Use 'Grid' infill not 'Lines', 'Lines' crisscross is every other layer and is not as strong as 'grids' every layer crisscross. The lid was sized to just snugly fit but if you're finding it too loose or tight, print the lid just very slightly resized in the direction you need. If it's just slightly too tight just take the lid off and on several times, should make it just right. Be sure to limit Infill to no more than 20% 'Grid' style as the honeycomb effect will help absorb very hard impacts. TPU Insert Instructions - Before putting the insert into the casing put a dab of glue on the bottom side of the insert (super glue works fine) then press it in (finger pressure should work just fine). The top edge of the insert should be just below the casing edge (roughly 1mm.)