Polytech R2 Pen Mount Centered

For Polytech R2 Car
This mounts on the rear of the car and you can have the pen go up or down so you can write on a white board on demand.
You will also need this thing https://www.thingiverse.com/thing:6964192 for the pen.

P.S.
In the 'Polytech_R2_Pen_Mount_Centered.stl' you must remove the two pilars on the servo holder with a plier and sand it.
The 'Linear _Gear_for_pen.stl' should have supports touching the bed enabled.