As part of my batch at the Recurse Center, I completed a script that maps bitmap images to an archimedes spiral. The goal was to develop a tool path strategy that is entirely unique to the AutoGraph pencil plotter capabilities. 

I had previously been using LaserGRBL to generate tool paths that scan horizontal and vertical like is appropriate for a laser engraver. This has achieved great results, but there is no reason why the AutoGraph needs to constrained to just horizontal and vertical lines. Print speeds are slow compared to a laser engraver so the mechanical dynamic benefits of moving straight along the xy axes are less impactful. 

GitHub Repo

Pencil plotter capabilities are unique but also sit on this interesting bridge between pen plotters and laser engravers. Unlike pen plotters that vary marking density to achieve the effect of light and dark, pen plotters and laser engravers are able to achieve light and dark with even the smallest marking. This allows laser engravers and pencil plotters to achieve higher printing resolution that a pen plotter. Color is where pen and pencil plotters start to share more in common. Pens are available in so many different mediums and colors. While there is not as much variety in graphite pencil leads, they still have a dozen options in hardness and at least a rainbow of colors. 

There are so many more unique pencil plotter capabilities to explore!