The design comes in two parts. The green part is a clip for the metal frame of I3 MK3 and red part is a holder for the Sharpies.
I used the combination of three basic Sharpie colors red, blue, and green. The final print has strong blue pigmentation. The green color is also seen but the red color changed into yellow. Maybe the change of the red pigment is caused by high temperature and printing it with lower temperature might have better results.
This idea comes from Devin from the youtube channel Make Anything. For more inspiration and ways to use this technique definitely check out his video.
I recreated this idea because I didn't want it to be mounted onto the extruder since I3 MK3 doesn't have that big of a frame and it would get in the way of extruder movements.
The author marked this model as their own original creation.