Zip-tie Tensioner for Raptor Reloaded

This alternative tensioner kit for Raptor Reloaded prosthetic hand uses zip-ties rather than screws to adjust the tension on individual tendon lines. This first iteration has not been tested yet, but I wanted to get the concept out so others can be playing with the design too.


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The wrist-powered prosthetic hands are sometimes failing due to the screws coming loose in the tensioner.  Zip-ties with a sliding buckle from another zip-tie makes a good way to get adjustment, but the zip-ties are a bit unsightly...  The redesigned tensioner block includes a cover so that the zip-ties are hidden.

The tensioner is sized for the 100% Raptor Reloaded gauntlet. Presumably it can be scaled with the slicer for higher percentages or if it doesn't fit perfectly.  

It is necessary to drill out the little latching tab in the zip-tie buckle in order to loop the tendon line through it.  Then the buckle from another zip-tie can be slipped on the other end for adjusting the tension.  After all lines are adjusted, snip off the zip-ties and slide the cover on.  Then add the regular retainer clip.


The Tensioner design was taken from  

The design was created in Tinkercad from the Raptor Reloaded stl file and it can be modified at



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Mini mugSkip Meetze published this design ago