For the version in the photo, I used Prusa's ColorPrint page to add a color change at 3mm (https://www.prusaprinters.org/color-print/). I printed with 100% infill trying to get the points right, but they still were not perfect.
Printer Brand:
Prusa
Printer:
i3 MK3
The author marked this model as their own original creation. Imported from Thingiverse.