Kaworu Chang shows how 3D printed an ultra-lightweight upper receiver using SpiderMaker carbon fiber nylon PA-CF for use on an airsoft P90... "Nozzle caliber 0.4mm, nozzle 240 degrees, bed 60 degrees, fan 50%, speed inside 80 outside 40. I only used 2 walls and only used 10% fill, maybe because of that it feels a bit soft

All opinions in the video are subjective, and opinion will vary due to each person's printing machine equipment and used materials. The premise of the of the video is: the material is well preserved, and it has not been damp or dried.

A material with a very peculiar feel, not as hard as PLA. To describe it, it should be... soft and tough, and it should be more resistant to falling? 
The surface texture is very beautiful, which can hide the layer pattern of the printer. The most important thing to overcome is the problem of wire drawing. It is strongly recommended to use a near-end extruder. And it is as close as possible. It is best to integrate the extruder gearbox into a heat sink, which can reduce the wire pulling to the greatest extent.

The most important thing: Nylon is very absorbent. After unpacking, it must be kept dry with a drying machine. It is best to supply the material while drying."