Plotter Conversion Kit for Anycubic Mega

A pen holder to turn your Mega printer into a 2D plotter, as silly as that sounds.
It's been designed around a Bic pen, since it's an extremely common model around the world, but it will obviously work just as fine for any other tool with the same diameter (8 mm).
The pen should slide freely in the holder, while the hook should fit very snugly, so the rubber band can pull on it.
Personal suggestion: give the hook about 1mm of play, so the rubber band will apply a gentle pressure and you won't need much retraction when you finish a line.

My printer is a Mega X, but the holder should work for all the other printers that use the same head. You can mount it on the left side if you wish, but keep in mind that will interfere with the x axis bump stop.

To prepare my gcode I follow the last part of this tutorial: https://urish.medium.com/how-to-turn-your-3d-printer-into-a-plotter-in-one-hour-d6fe14559f1a