Boston Dynamics has been developing advanced robots for quite some time now, including the robot dog SpotMini . YouBionic has now introduced a concept with 3D printed arms to give this beautiful base not only feet but also hands.
Only a concept?
This company offers a fully 3D printed arm solution for the Boston Dynamics SpotMini. YouBionic sells the 3D models $179 which you have to print and assemble yourself.
There is not much documentation yet on how the system will work in practice - the STLs contain the structural components, but not the electronics. And that's not unimportant. It's a fascinating concept and can be the beginning of a true component based robotics solution.