Robotic Pen Retractor

This simple servo mount and pen holder allows students to convert their OneBot from PAtton Robotics into a drawing robot. The Servo holder and Battery support are both printed with adjustment slots to allow for fine alignment during mounting. Servos will need to be moved out 1/4 inch on each side to allow room for the pens movement. I used simple 1/4 inch #6 spacers for each of the 4 servo mounts.A video of the robot drawing can be found here: https://youtu.be/w0EUtNYol1U