Wobble Ring Stepping Motor V2!!

This is a snap together version (some glue) of my printable motor. It has been shrunk and uses only 9 pieces, air pistons included.

The bellowPiston part is printed with no infill and needs to be airtight. When inflated it extends outward to push the glued on bellowLink part. The bellowLinks then push the wobbleRing, meshing with the drivenGear. Each piston is inflated and deflated sequentially to "step" the motor 4 degrees forward or backwards.

This thing is the successor to this:
http://www.thingiverse.com/thing:33853

And uses sgcg's fastener library
http://www.thingiverse.com/thing:15915

Also uses mechadense's epi-hypocycloids from:
http://www.thingiverse.com/thing:28237

The bellows used are modeled after this general shape:
http://www.f295.org/main/content.php?120-Paper-Gaffer-s-Tape-Bellows

Though I hope this latest version shows much improvement, I realize there is always room for better design. Please, chime in if you see room for improvement.

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