26650 to 18650 battery adapter
thingiverse
I redesigned the sleeve to accommodate an 18650 battery instead of a 26650. Last night's test print didn't quite fit, so I made some adjustments. This new version has a slightly larger interior diameter and is about 5mm shorter. To make it easier for the 18650 to protrude out, I lowered its height to 60mm. Also, the sleeve's internal diameter was reduced to 20mm. However, surprisingly, an 18mm battery doesn't fit in an 18mm tube. This design's interior diameter has been increased to 19mm from v1. Unfortunately, the test with a 20mm battery resulted in a loose fit, so I tried again and it seems a bit too tight for one of my batteries (the red-coated one).
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