Arm rest Interstuhl office chairs

The rubber arm rests of my WFH office chair (Interstuhl Prosedia Se7en model 3462 broke down and pretty much disintegrated. Replacements are 50 euro each, so I wanted to make my own. Should fit chair models 16G2 3462, 16G2 3464, and Everyis 142E.

• You can use the molds (sharp outer edges) to cast silicon for padding and top the silicon with the rounded design, using tpu to print them. 
• Alternatively, you can use the existing (thin) foam, although de arm rests might need to be reduced in height for that. 
• Third option: cast the silicon directly in the tpu printed armrests - I don't know how the silicon interacts with the tpu print. 
• Final option (I tried this initially, but found it very difficult to fasten) is to use the molds for silicon arm rests and top them with fabric. 

I used 27(A) silicon and 95(A) tpu to cast and print the arm rests. This results in quite firm arm rests: you might consider using materials with a slightly lower Shore hardness.

I printed the molds first in pla and cast the silicon. De-molded and printed the rounded designs in tpu to top the silicon. Optionally deburr the edges of the tpu carefully.