But wanting to add a little visual flair to his prints, [Devin Montes] came up with a simple 3D printed mount that holds the tip of up to three Sharpie permanent markers against the filament as it ...

Sharpie permanent markers are one of the ... markers from a hard plastic toy or container? Take a dry-erase marker and color over the permanent marker marks. Wipe the dry-erase marker off with ...