Plotter addon for 3D Printer

Pen plotter addon for 3D printer. Made in Freecad. Included sources, published here.

It is easily mounted on the side of the 40 mm layer fan and can be left permanently installed.

You will need some smooth 4mm in diameter shaft cut to length (two pieces). I used aluminum but other materials such as PVC, steel, carbon fiber, etc. can be used. The shafts can be pressed in, no glue needed.

It uses a standard SG90 miniservo. You can find wether your printer has free pins and activate one for the servo in Marlin.

You also will need a short 2 mm in diameter screw for the connecting rod, and standard screws to mount the servo, and its arm to the connecting rod.

The pen holder is a small piece that you can easily interchange for different pen sizes (I have to design yet different pen holders, for example for a fountain pen). It can be removed or left mounted while 3D printing. It has a captive screw to keep the pen in place, to which you can make a groove so it is at the same he