You can print everything but the finger distals with no support.
An excellent step-by-step tutorial, in 3 parts:
The cable anchor for the Talon Hand uses set screws. Use a 0.065" trimmer line (i.e. for landscaping) for the cables. The hand will open without elastics if you mount the anchor forward and close to the cable guide (the cables push and pull). You can install elastics if your hand is not opening satisfactorily. But if possible, avoid elastics, since they make it more difficult to close the hand.
Here is the hardware list for a build at the scale of 1, a good size for a 4-5 year old child.
Adults require this to be printed at a scale about of 1.6 and so the hardware should be larger for an adult build. Here's a list of hardware for a Talon Hand at scale of 1.6:
You can make a closure with Velcro or double D-rings. OdyBars are for a child's device and uses a single strap on the third hole. There is a space so the strap is comfortable between the plastic and leather. ArmBars are for an adult's device and use two straps. Loop the straps in holes 1 and 3.
If you print small, the spaces between the parts will be smaller, so more finishing is usually needed. If you print the device small (100-130%) use PPsnap4small instead of ProxPhalSnap (better for 140-160%)
Extremely limited release and no longer available at Hill Farmstead