I made a few changes on the MMU Remix from DesignFlaw06:

- Scaled the unicorn to 160mm height
- Right Ear part is thicker for better printing
- Hair part on forehead is also thicker for better printing
- Horn is scaled up a bit ~10%
- 3 Perimeters on Body part, because with some white filaments you can see the "wipe into infill" from the other colours with only 2 perimeters
- Added nose holes in different colour
- Added different Extruders for tail and hair, so you have different rainbow colour transition on both parts
- Added Colorchange Pause on height 122mm for swapping filament of Extruder 5 for the Horn
- You can also remove the colour change at 122mm and print the tail and hair in the same colour, so you get one Extruder free for the horn
- Painted almost all seams by hand inside the parts, so there is only a visible seam on the tail, on the back side of the front feet and on the top part of the hair
- Painted custom supports on few spots
- 3 Instances for maximum wipetower reduction
- Wipe into infill for most parts for wipetower reduction

Pre-Flight-Cheks:
- Check before printing if purging volume matches your filament
- Check before printing if filament setting machtes your filament (bedtemp/extrtemp)
- Check before printing if your printer acts correctly on "M601" for Pause at 122mm (when printing with Octoprint there might be some problems with the communication), if not you have time for swapping the Extruder 5 filament between 117.4mm and 122.2mm height

The 3MF File was saved with PrusaSlicer 2.3.1 Win64. I don't know if an older version can load the file without any issues. You should load it with the same or higher version of PrusaSlicer.