Note that the expensive one has myoelectric sensors and electromechanical actuators, while the 3d printed one is purely mechanic, which means it might not be su

Note that the expensive one has myoelectric sensors and electromechanical actuators, while the 3d printed one is purely mechanic, which means it might not be suitable for all the people without a hand (my guess is that it needs at least part of the muscles of the wrist to be present and working correctly, as they are effectively moving all the mechanical parts in the hand).