Tech2C from Australia made a video on how he uses his 3d printer as a plotter. He attached a pen to his extruder and uses is to draw on a paper. He also goes into how he uses Cura, g-code and various settings to get the best drawing.
Here is the video of the plotter in action:
Tech2C YT channel:
Here is the pen attached to the extruder:
Here is close up of one of the drawings in process. It's a B-17 Flying Fortress: