Standard print settings should work well, I used “0.20mm SPEED” in PrusaSlicer with an i3 MK3S. The infill density was increased to 50% to make the arms a bit more durable, but this may not be necessary. Long version prints in about 1:30.

Print it upright, then no support material is needed.

I tried PETG and PLA, both work well. PLA is a bit snappier when inserting a cell (but it may be more prone to break in the long term).