Here is a thingiverse nautilus spiral gear set I just printed. I wondered if they turned 360 deg, they don’t 😦 They should have had concave big ends and differently shaped teeth at both ends.
But they are cool as-is and turn around all the way up to the ends. The new nozzle and hot-end are making better part finishes than the prior nozzle. No, the black plastic hardware is commercially molded- I just had them laying around from https://secure.microplastics.com/