So, as you say you want to materials for printing robotics parts. And as you have not given any budget constraint, I would give you a list of materials which would help you achieve the task, and you can choose amongst them accordingly.
- Plastics: Basically used for building prototypes. Nylon Polyamide should be a choice for you.
Polyamide 3D printing is achieved through SLS 3D printing. It offers
strong and flexible prints. The upside of this material is that the
printing technology requires minimum preparation of the 3D file before
printing. There is no need for support. And it also offers the
possibility to create intricate shapes and moving part in just one go.
After the print the polyamide can be polished and dyed.
- Metals: Metals like Brass, Alumunium and Steel should be a good choice.
But, if I were to achieve your task, I would select carbon fiber. some details about it:
Carbon fiber consists of 90% carbon atoms, each fiber is 10 times
thinner than a human hair. Carbon is especially prized for its lack of
combustibility and infusability but also by its incredible strength
(stronger than steel) and ability to create flexible structure, light
weight and corrosion resistance. Its melting temperature is 1500, this
heat there are only carbon.