I have a 3D printer, if you give me dimensions of the cell, there's a parametric 18650 holder up on Thingiverse, I may be able to modify it for the other battery dimensions and print one for you.
I'm going to be printing an 18650 holder myself that's integrated into a camera holder and a spot for a voltage regulator board.
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Work: the 8 hours that separates bike rides.