You cannot adjust the z scaling on any hueforge. This will mess with the coloring done and your hueforge will not come out as intended. You can however change the x and y to scale the picture.

Print at 100% infill with a layer height of 0.08mm with a base layer of 0.16mm
Swap Instructions:

Start with Black

At layer #9 (0.8mm) swap to Pink
At layer #16 (1.36mm) swap to Yellow

At layer #21 (1.76mm) swap to Beige for the rest.