A small round bellow with:
– holes for air (or water/oil/…)
– attachment flanges

Inner surfaces are optimized to be airtight.
That is: Horizontal surfaces are fully averted.

This is basically a round version of
the same as "Experimental Rectangular FlexBellow" here:
– https://www.printables.com/model/430603-experimental-rectangular-flexbellow
– migrated from here https://www.thingiverse.com/thing:2946210

This one is stiffer than the square one. 
Probably a bit too stiff.
I's suggest setting the walls a bit thinner maybe.

Print with:
– high infill, maybe a bit more than 100%
– multiple perimeters
– infill interdigitating perimeters

Category: Other