Print at 100% infill with a layer height of 0.04

Initial layer height at .24

Start with Dark Blue
    At layer #8 (0.52mm) swap to Red
    At layer #18 (0.92mm) swap to Yellow
    At layer #22 (1.08mm) swap to Jade White for the rest.

(this is what I used for colors)

This is for the was used on the P1S with ams, if you want a grey scale just use black then switch to a darker grey then a lighter one and last white 

you can look up the tutorial for getting the speeds set up for this and it might very some from printer to printer.

just google up hueforge style print set ups on youtube 

Enjoy