Thanks to @JanTec for featuring my model on YouTube (from 3:33 with English captions)
@Spacekoaster made me realize that if you use Prusament, there is a small notch in the spool that prevents it from spinning smoothly. I didn't realized this because i don't use Prusament as much :-(
I don't think this will affect print quality, but just in case, i designed a ring that fits into the middle of the Prusament's spool in hopes of minimizing the bumping effects.
And if you don't want to print and use rings when you print with Prusament, you can temporarily unscrew the spool holder and screw it back with the Add-On and PTFE tubes facing down
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Autor tento model zremixoval.
I use the dimensions to design one that fits on the Original Prusa Spool Holder