Fusion Arm

cults3d

Prosthetic hand design, crafted as part of a comprehensive arm system for individuals who have undergone trans-radial amputation. The upper arm components are still under development. A prosthetic arm designed specifically for trans-radial amputees is currently in the works. Upper arm parts are still to be completed. The individual components are remarkably small; I strongly advise printing them at a minimum of 180% or even 240% scale for an adult model. To avoid the need for support structures, ensure that the finger joints are printed on their sides, with the connecting male/female parts facing upwards. The design comprises multiple finger joints: First finger joint - Finger 1 (*5) Second finger joint - Finger 2 (*4) Third finger joint - Finger 3 (*4) Additionally, there are two thumb joints: First thumb joint - Thumb 1 (*1) Second thumb joint - Thumb 2 (1*) To assemble the hand, thread an elastic string (~6") through the top of each finger and down into the palm. Secure both ends tightly. Next, thread a strong, thin non-elastic string (~18") through the bottom set of holes. Tie it off at the finger tip, ideally around the base of the elastic knot. To secure the upper arm in place, apply Gorilla Glue or a similar strong adhesive to the nub, connecting it to arm cup p1 and arm cup p2. For optimal results, strive to maintain consistent tension when tying the strings around the nub. This should result in fingers that are very slightly bent. When you gently pull on the non-elastic strings (bending your elbow), the hand should close accordingly. --- Update: I have abandoned threading regular string through the thumb joint, opting instead for elastic thread, which yields better results --- --- Fairing can serve as a replacement for arm cup p1 --- *Number of components required to complete the hand* Please note that this prosthetic arm design has not undergone extensive testing.