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Fixed filament guide for Ultimaker 3
This filament guide screws to your printer as a replacement for the cable cover, and you will never loose or forget it again!
It will ONLY fit the regular Ultimaker 3, not the extended version, because of the different placements of the holes for the cable cover. I might make one for the extended if it is requested.
Print it like in the image above from Cura, and you will not need any supports at all.