UnLimbited Arm v2.1 incremental release

We have just updated our UnLimbited arm to v2.1. It now has a smoother rounded cuff for comfier use, we have also included a cleaned version of the phoenix palm that has the word EXPERIMENTAL removed. The version number, together with the three key measurements and the calculated print scale% for the phoenix hand, are now stamped on the underside of the cuff for future reference.

Files can be found here: http://www.thingiverse.com/thing:1672381