This object was entered in the MakeShaper Design Challenge (see all entries here).
This model is an interesting test of the concept of Interface Bonds. As TPU has some difficulty adhering to PETG and ABS when printed directly onto a face, a better, and more durable mode of adhesion for heavy use applications is needed.
Interface bonds are when a material is bonded to another with the use of internal geometry. The flexible sections have links inside the fingers to prevent them from becoming loose, and it is a very strong connection.
This concept of Interface Bonds has quite a few applications, and prosthetic limbs are one of them. More realistic movements, lower cost and easier customization to each patient can be acheved with the use of a rigid material combined with a flexible material.
This model has internal geometry to be able to run fising line through, to act as tendons.
The recommended material for the joints is TPU 85A. 95A might be too stiff, and I have not tested with 60A.
I scaled the print up by a factor of 1.2, or 120% for the test model. Depending on what diameter of the fishing line you get for the tendons, printing even larger might be required.