I have been playing around with multi colour prints with my Ender 3 printer with a single extruder. I created a few designs for keyrings for the Mazda MX-5.
There is 3 different designs, for the different eras of the MX-5 and a Miata variant. There is a embossed variant for the 3 designs as well that makes easier to print with a simple colour change.
Printing instructions:
For printers with a single extruder you need to perform some configurations on the slicer to make it work, for the embossed print follow this guide for prusa slicer: link
For the multicolour prints follow this video guide: link (I recommend to disable skirt)
The author marked this model as their own original creation.