Multicolor AutoPen Gripper - Robotic Pen Changer & Drawer

AutoPen Gripper - Robotic Pen Changer & Drawer for MGN12 linier rail block. What is this? This is a pen plotter / autopen, pen holder that can grab different pens while doing the same drawing. Features: pen detection / pen changing functionality. How? : It uses a servo to hold the pen. And another servo that makes the pen go up and down so it can draw on your CNC machine. Requirements: A CNC frame that has a MGN12 mounting block on the Y linier rail trolly. janky Instructions : Print at 100% infill , assemble. janky Parts list: Mgn12 linier rail. 2x, 5mm Rods 100mm long 2x, 5mm id , 10mm long bearings size for liner rail. 2x 5mm id 5mm length bearings for Z push arm. M2 screws. 2x 5mm dia , 25mm long metal dowel stainless. 2x 20kg metal servos. 2x springs with a 5mm id. 1x ender3 type mechanical end stop switch for pen detection. 2 Bolts and 2 nuts either M3 or M4 size