Ender 3 Pro Pen Plotter with auto load

a design making an Ender 3 Pro printer into a pen plotter.
This design has 3 parts, the pen boot to hold the drawing tool, the cradle to hold the boot when not being used, and the Holder that mounts next to the metal fan cover, and holds the boot when drawing. The boot has a weighted top peace to hold the pen down (additional metal washers can be used for additional pressure). Several variations of the boot are included to accommodate different pen types ( I even used a pen with a push button light tip to level the bed). The Holder uses the left and top existing fan cover screws to hold it in place. The cradle slides into the top rail V slit and rest on the left upright post.
for loading the pen while printing in order to add color or add ink to the inside of your object, or just want your printer to do the work,
add at the beginning of your G code these lines:
; pen load
G28 ; Home all axes
G92 E0 ; Reset Extruder
G1 F600 E-7.5 ;retract filament
G1 F1200 X25 Z60 ; move pe