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Excellent design, bravo!

Three suggestions:

  1. make the soft jaws identical, only have them use a central lock of some sort (pin, snap, whatever). You already have good central access on the stationary and movable jaw so the lock hole could be through for easy change, or 3d printed fastener/clip.
  2. Please, a "blank" jaw file in step or X_T parasolid format so ppl can model their own clamp profiles.
  3. Screw shafts with 45 degree buttress threads with the 7 degree face up (towards the gears).