The Pen Puck is a CNC pen holder designed to fit securely into a 66 mm router mount, such as the Kobalt router clamp. It replaces the router to turn your CNC into a precision plotter or drawing tool. The puck slides into the circular tool mount and locks in place just like the router. A pen, marker, or pencil can be fastened using zip ties or tape for quick setup. Best printed in PETG with a 0.2 mm layer height, the Pen Puck provides a durable, accurate, and affordable way to test toolpaths or create detailed line work without running the spindle.