A plotter attachment that will fit multiple pens, I use 2 clamps per spring.
-fine and springy
-fine and tough
-wide and tough
Gives pretty good results when plotting, but a step skipping seems to occur when changing pens, might be me bumping into the print bed.
I use Inkscape with gcodetools to create the gcode for the K8200, just round all dimensions to 4 digits in gcodetools preferences.
Do a test run (low feedrate) to match your Z-offset and pen position.
for the springs, the skin should be at least 3mm thick to keep the dovetail from snapping.
the thinnest spring is designed to be printed on a .35mm nozzle
Work in progress, testing out the limits of the K8200 step1
I built this to get more acquainted with 3d printing and CNC in general, a plotter seemed to be the first step in CNC. I might update this file to include a two sided dovetail clip, so you could use one spring at the top and one at the bottom to stabilise the pen. But a rubber band does the trick for me (for really basic plotting all you need is a rubber band).
Next up I would like to try a mill mod such as
Sillano Marco http://www.thingiverse.com/thing:951383