Designed this as i wanted to be able to easily label the side of the spool as to what type of filament is in it. Also added a ring around the inner edge to easily hold the loose end of the filament. So far i've only tested this with Eryone and Gratkit cardboard spools between 75mm ID to 90mm ID and works great. With the 75mm ID its tight but does fit nice and snug.
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.