hex nut M3 standoff
thingiverse
Designed to serve as a versatile PCB standoff for quadrocopter construction, these components can easily be adapted for use in any PCB or other application. They should accommodate M3 screws with no issues whatsoever. I have personally tested an 8mm version printed using eSun ePA (nylon) filament and found that apart from some minor stringing, it performed exceptionally well and was 100% usable.
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