The Pen Plotter is designed for a BIC pen like you see in the pictures. 

To attach the Pen Plotter you have to get rid of the print head housing by using the Blower fan quick release by DrewDeeDoo. 

Use the screw holes designated for the housing to screw in the Plotter by using whatever screw you got lying around that fits through the opening.

To hold the pen in place push the "holder" with an allen key. 

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for printing I used:

20% infill  -  0.2 mm layer height