The condyloid joint is nature’s answer to the problem of two degrees of freedom within the knuckle of the finger. However, as mentioned previously, nature does not always transfer well into mechanics. This is true of the condyloid joint in the knuckle.

To create a practical condyloid joint within this model, the joint must be small while not restricting the range of movement. However, to keep these features while also being small would require an external part latching the two joint parts together.

Replacing the joint with a mechanical universal joint offers a similar range of movement while potentially being easier to design for this use case. The difficulty of this joint is the need for small, load bearing parts. This limits some aspects of the design, requiring the parts to be made as large as possible.

This, first implementation of the design uses M2 screws as the load bearing hinge and uses the largest size of arm as possible while not restricting movement. However, the PLA material used may not be suitable for this joint. The joint might also be too small to take advantage of fibre glass reinforcing from the Markforge nylon printer.