This is a compliant mechanism set of pliers/grippers (I call it the biter) that I custom designed. This is designed to create an immense amount of torqe, so please be careful and do not put your fingers in the grippers.
It is all one piece and designed to be printed without any supports. The joints are flexible compliant mechanisms that enable this to be printed as one solid piece. This model will not work with PLA. I recommend a rigid TPU/TPE (>98A), PCTPE, or Nylon without any fillers. If you have trouble printing this, please feel free to contact me with any questions.