Experiments using an old 3D printer as a pen plotter, heavily drawn from https://github.com/brianlow/plotter. Have a look at Flower for the pattern shown below

If you already have PrusaSlicer installed, you’re ready for a quick start

• Use Prusa Slicer for gcode generation from an existing SVG
  • alternativly: Generate text and shapes directly with the slicer
• Use SD Card or Pronterface (via USB) to transfer gcode
  • Pronterface offers a 2-click start solution. (Pronterface is a tool which comes with PrusaSlicer if you choose to install it.)

• Print and add plotter holder https://www.printables.com/model/63385-pen-plotter-attachment-for-prusa-mk3s
• Lower PINDA Sensor to accommodate for the 10mm longer pen tip (optional but recommended)
• Perform a first layer calibration on thick paper (if PINDA was moved)
  • Issue: bed heats up to 50°C and warps your first paper
  • Only needs to be done once

• Copy PLA Profile
• Change Temperature to something safe (reduce burn risk) like
  • Nozzle: 40°C (above room temperature, if lower, printer will not start)
  • Bed: 20°C
• Set z hop to 1-2mm (Filament Overrides -> Lift height) - to prevent travel moves from being drawn on uneven paper

• Move origin by X:-41.40 Y:-39.10 by setting the bed origin to those values (and reduce bed size accordingly) to account for the pen being at an offset
• Remove intro line (start gcode) as it sometimes collides with paper holder and is unnecessary anyway
• Removal of mesh bed leveling is not recommended but possible

• Change Infill->Bottom Fill pattern to fill boxes and other shapes interestingly, e.g. with Hilbert curves

• Load SVG into slicer, set height to one layer (0.2mm)
• Slice gcode
• Save to disk
• Remove cap from pen (if not: homing will not work due to crash)
• Transfer to printer
  • via SD card
  • via Pronterface: Load gcode, click print
    • On main screen: Button "load file"
    • "Print"-Button to start the print
• Do Live-Z adjustments for perfect line width from the printer's menu. Greatly improves visual appearance of the lines. Too much force adds too much thickness and unevenness, especially at corners

• Add a marlin pause command to Prusa Slicer, so you can adjust the pen or even add the pen right at the start of the plot for adjustment
• Do a calibration
  • With Pronterface move loaded pen to lower left corner
    • Result: X:41.40 Y:39.10
    • Create Printer Profile with Offset Bed Origin at X:-41.40 Y:-39.10 and place objects on grey bed area
  • Upper right corner is still X=255, Y=209 (obviously) but usable size is smaller
  • z: Moving PINDA probe so that a z=0 equals not touching the paper but 1mm above. Then adjust via live-z to z=-1mm the actual printing. That way bed leveling does not draw but actual drawing does
    • note: printer cannot move below z=0, so live-z has to do it. One cannot set a z offset to go below 0, but positive z-offset can account for paper or tile thickness, e.g., a ceramic tile has 7mm thickness

• Use first text marker, then fine line. The other way around, text marker smears
• Beware of the offset of the different holders. A thinner pen has another y-coordinate than a thicker pen. This creates an offset on the paper if the clamping holder is used instead of the auto-centering
• Mesh bed leveling should not draw, but an incorrect z of the pen holder can create unwanted lines. Be extra careful when inserting the pens
  • Hack: pause a print and then insert the holder and tighten the screws, adjust z height of the pen
• Slicing mode->Close holes can help with filigree details
• Printing on high objects (e.g., a tile of 7mm height)
  • Bed leveling and PINDA will collide with tile, so
    • Generate gcode with a z-offset of 8mm
    • Start print, pause on first line after leveling
    • Add tile
    • Insert and adjust pen to correct height (which is 7mm higher than usual)
  • Perfect bed leveling and repeatability; only attach tile after leveling
  • Printing at 200% speed is also fine

• https://github.com/brianlow/plotter
• https://www.printables.com/model/63385-pen-plotter-attachment-for-prusa-mk3s/comments
  • especially https://www.printables.com/make/557511
• https://github.com/SonarSonic/DrawingBotV3
• https://plotterfiles.com
• https://github.com/beardicus/awesome-plotters
• Generative art and sharing: https://turtletoy.net/turtle/browse/love/