This simple part let's you screw in an M5 Eyebolt and attach it to the top of your MK3S+ to neatly guide filament without the spool being pulled of to the side or up by the hotend as well as the filament getting thrown of from the spool and tangling. It also ensures the filament doesn't get scraped or that the guide isn't worn after some time (with completely 3D printed guides)