Printed in PAHT-CF by BBL. Printed perfectly, the CF added extra friction, but it's already functional without lubing. After lubing it gets much better.

I've updated to 4 stars, as I've used a smaller magnet, which could arguably not be as strong as the one proposed by the author. There is a slightly low tolerance on the thread, but I managed to wear it out; as soon as that is sorted, it grips really well to the spool (tried only on original Bambulab spools so far). In general, the system works well to rewind it, but it's not useful for loading, so you have to unplug the PTFE cable from the fitting to load it. It's not ideal, but for an unmotorized solution, I believe this is great. Also to be fair, I didn't add the felt gliders yet, that could make it much more consistent leading to a solid 5 ⭐️. I'll do that soon and update my review again in case that sorts it out. PS: The magnets I've used are 12x3mm instead of 15x3mm, but they are quite strong.

Printed nicely in PETG Translucent Clear. Had to polish the edges of the cilinders a bit, maybe -0.1mm each side.