FeralQuads Fenrir Arm Protector

Print them from TPU, with supports. There are multiple versions. Light, lighter and lightest. The higher the numbers in the tags, the thicker the base layers.
"fouble" tag refers for sandwitch design, those have full cover for the arm top and bottom (one is soft mount layer, the other is dust protection for the lower hole below the motor)
"fang" refers that the design have some parts sticking out - these have extra thickness on certain impact points.