As the PU foam of my armrest was crumbling I designed some new armrests similar to the old design.

I tested the design in 2 versions. One in TPU 95(Sainsmart) and one in TPU 85A (Ninjatek Ninjaflex).

The settings in the 3MF file are based on Ninjaflex TPU as I like that one the most. If you want to print using TPU95 I got the best results when changing the infill from gyroid to aligned rectilinear 15%.

I had a couple of failures with Ninjaflex and tried some rear mounted bearing based spool holders on my X1C but in the end it was due to the filament being too tightly wound around the spool. I rewound the spool and everything went fine.