fox 40 knobs
thingiverse
here you can find the stl to print and replace both knob of a fox 40, i suggest a silk filament to better looks the air cap must be guided in the fisrt part of the thread, maybe with a better printer than mine there is no need I had included some images for laser engraving, i did many test but with my colour had no good results: DO NOT engrave PLA indoor! have fun!
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