[wlesieutre]

Interesting note on the AxiDraw, the way it holds the pen at an angle and drags it around means it can work with a fountain pen where you need the nib held with a softer angle relative to the paper (both tines touching, ink flows out in between). The photo shows it with a Lamy Safari.

I don't think this is the case with regular pen plotters, which look like they hold the pen vertically and keep it fixed as it draws in different directions. Some pens will write vertically, but it's not ideal depending on the nib grind. The bottom corner of the nib is rounded to work at a range of angles, but the top might have sharper edges that would catch when dragging it upward.

EDIT - I suppose you could make an adapter for a pen plotter that would hold it at an angle though.

[tobiastoft]

I tried putting a calligraphy pen in my plotter and it was definitely rough on the nib because of the angle. With continuous line drawing it would probably be ok, but too much up/down movement might get messy. Still fun to watch though! Here's a short video of it in action: https://www.instagram.com/p/BNCxyfLBh8_/

[salgernon]

Those folks also sold “Sylvia’s watercolor not” which was designed around, well, water color painting via the same mechanism.

They also sell an “eggbot” for drawing on Easter eggs. Wonderful stuff.

[meatsock]

dont forget you would have to prevent the modified regular pen plotter from dragging the angled fountain pen the wrong way

[wlesieutre]

As long as it's not a particularly flexible nib (and most aren't these days) you can pretty much push it any direction once you have it at an angle. Lucky for me, otherwise I'd have trouble with down strokes (left-handed overwriter).