18650 Battery Case - ergonomic rounded grip

thingiverse

Printed @Erikjuh's 18650 Battery Case and really liked it! The fit is perfect and the thread is snug and accurate. Very easy print. However, I found the shape a little bulky in the hands - the edges dig in and feel a little uncomfortable. They also use up a lot of material. So I made a quick and dirty remix in Tinkercad rounding the edges. The result is a more ergonomic feel while keeping the nice upright stability intact. I also found the thread very long; I counted about 22 hand motions opening it up. I found this version with less than half the thread length closes just as snugly and is easier to handle, at the expense of not fitting cells that are much longer than 65mm. The container still goes up to cover the entire regular 18650 cell. Provided are two versions for the top, one closed for waterproof carrying and one arguably safer version which provides a tiny little 1.3mm hole to prevent explosions if the cell gasses out for safety reasons.