It is definitely possible to 3D print electronics on a real hand
Researchers at the University of Minnesota 3D printed electronics on a real hand. According to them, additive manufacturing would provide real‐time feedback control and direct ink writing of functional materials in order to fabricate devices on moving freeform surfaces.
In this research, they have demonstrated that the “changes of states in the 3D printing workspace in terms of the geometries and motions of target surfaces can be perceived by an integrated robotic system aided by computer vision. A hybrid fabrication procedure combining 3D printing of electrical connects with automatic pick‐and‐placing of surface‐mounted electronic components yields functional electronic devices on a free‐moving human hand.”
This video shows the 3D printing process on a human hand:
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