Colors your filament without printing any partsSteps: 1>Drill 1.75mm hole in end of Sharpie casing 2>Remove Sharpie tip with needle nose pliers 3>Heat end of your filament with cigarette lighter about 20mm from end 4>pull the 20mm piece of filament away from heated section to create pointed tip 5>Cut stringed filament from pointed tip(make as smooth as possible) 6>Straighten about 15cm of filament after the pointed tip 7>Slowly insert pointed tip in to drilled out end of Sharpie 8>Filament may need to be rotated a few times to pass all the way through the Sharpie 9>Print Away!!! 10>I just use a piece of tape to cover the drilled hole when not in use.