compact middle_piece for 3d printed shoulder rig

I'm currently printing parts for a new shoulder rig on the Thing-o-Matic.
Thus I noticed that thee middle_piece (an often reused clamp in the design)
is not as easy to print on the Thing-o-Matic as it is on the Repman.

Thus I designed a variation that is smaller and easier to print.

• Blog post about the original shoulder rig
• Design files on Thingiverse
• Photos
• Video
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