+1! The real matter is definitely to prevent the filament to unroll more than necessary (like, every time you swap rolls...) because this is where trouble starts.

She really looks nice, but what did you do to prevent the filament from interweaving into itself? Imho you should put some sort of clip on to it, so one can can assure it from releasing several roundabouts and giving it a change to glide over or under another string. The first time this happened to me was in a Fablab and ik spend a lot of time trying to unleash some of the other spoolholders. Years ago we had several knitting machines and it got clear to me, it's not the spooling itself or taking wathever amount of it. It is the trick to keep it like it is the moment you stop. Don't try to fasten it farther than it is at that moment and surely don't let it unroll. So in my opinion, you need some sort of clip to fixate the filament the moment you stop and take the holder to another place. I love your design and would like to print it out, but with some alterations, because of: <br>- the clip I mentioned before (I make use of the holes in de outer border of the spool, but you have to bend the filament to avoid slipping and have to heat it (pla)&nbsp;to avoid breaking or take a rather large amount , but thats not handy)<br>- I want to rewind some of these spools and need a 8.5mm hole in the center to be able to assemble some kind of turnaround mechanism <br>- I my self use Ultimaker filament and the spools are slightly different:-) 200 x 53mm with a center hole of 53mm <br>- Can you take a picture of the center? From here it's not clear how it looks like.<br><br>Would you be so kind to make at least&nbsp;&nbsp;the adjustment to the original cadfile for the use with Ultimaker (and other)spools? Or even the file itself?<br><br>Keep up the beauty