I printed this at .15mm layer height. I used ironing on all top surfaces to give it a better looking finish.

Three total colors, two total color changes.

Start with white up to 1.7mm, switch to orange from 1.7mm-2.0mm, then finish with black from 2.0mm to 2.15mm

Edit: I just realized another user (PhilippHee) already created something very similar to this design. Great minds think alike!