An edit for making the palette test model easier to print using PETG with a MK4S MMU3 setup. This is setup for use with Prusament PETG, it should work well with other PETG filaments.
In the image, the first 4 filaments are Prusament PETG, while the 5th one is from CC3D.
The author remixed this model.
Modified files for using a MK4S printer with the MMU3 upgrade, specially with Prusament PETG filament.