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Prosthetic arm designed for trans-radial amputees. Upper arm parts are still to come. Parts are very small, I recommend printing them at at least 180% maybe 240% for an adult. The finger joints can be printed on their sides, just make sure they are printed with the connecting male/female parts facing up in order to avoid needing any support structure.
Finger 1 (*5) - first finger joint
Finger 2 (*4) - second finger joint
Finger 3 (*4) - third finger joint
Thumb 1 (*1) - first thumb joint
Thumb 2 (1*) - Second thumb joint
Thread an elastic string (~6") Through the top of in each finger and down through the palm, tie it off tightly at both ends.
Thread a strong and thin non-elastic string (~18") through the bottom set of holes. Tie it off at the finger tip (I usually tie it around the base of the elastic knot at the finger tip)
Gorilla Glue (or some kind of strong glue like Rez n Bond) nub into upper arm and arm cup p1 to arm cup p2
Try to keep the tension as similar as possible and tie all the the strings around around nub with a little bit of tension (just enough that the fingers are very slightly bent)
When you pull the plain strings (bend elbow) coming out of the base of the palm, the hand should close.
--- UPDATE: I've stopped threading regular string through the thumb (but still use elastic), it works better rigid ---
--- Fairing can replace arm cup p1 ---
*number needed for full hand
Please note, This arm is not extensively tested