i was out on a stroll in a hardware store looking for threaded inserts and axles, and i found a nylon nut, i got it in M4x10mm, so i cut the head and it worked fine as an axle, it’s a lot more lightweight than a stainless steel or titanium axle and i got it for mere cents(Rp 1.500/15¥)
that would be a problem, just don’t over tighten them, you can’t really feel when it’s snug or not like you could with a metal axle, i already snapped one of them, fortunately it snapped right in the middle
i don’t have a “true” fixed axle yoyo, but i got a nylon transaxle that i glue into a yoyo, the transaxle doesn’t spin at all so it might count as a fixed axle. it’s as smooth as a metal axle but the string and the transaxle would sometime bonds into one another, and need to be thrown hard to unbond it, i’m not sure if it’s from the plastic cement i used to glue it down or from the heat though, it still happen even now
Nylon has a much lower melting point than polyester. I like to put adhesive wood veneer around my nylon transaxles. $5 for 3 sheets of veneer from the craft Shop will do several hundred yoyos