About this 3D model

This is an addon for the Prusa i3 Mk8 3d printer/clones thereof. You can use a pen with a diameter up to 15mm. To use this, remove the heatsink and cooler of your extruder and replace it with the print. 4 additional M3 screws hold the pen in place. For calibration, home the printhead, move the z axis up a few mm and drop the pen in the holder. Fasten the screws and note the z offset for your plotter software. (I am using Inkscape)