Learning from the limitations of the previous prototype, a second joint was designed.

The tolerance of 0.1mm worked perfectly to have a nice smooth motion at the joint, and 100% infill left the parts very strong for their size.

When printing, the parts were arranged to have the parts where the tolerance was most important faced upwards as the mating surface to the bed leaves a rough finish, this was a major issue in the first print. This joint is designed to have a tortion spiring along the screw as the return force.

This is only the central link of the finger and so no finger tip or base is shown.

This is designed to be the core of the finger, similar to the human bone. Intended to be the centre of the finger, other elements can be designed to be screwed onto this as part of a modular design.