I created this Art-Deco inspired pattern in Affinity Designer and turned it into a model using Plasticity3D.
To create the two-colour appearance I made a material change using PrusaSlicer at the 4mm layer height from black PLA+ to Silk Gold. You could make the colours anything you like - this is just what I chose.
Here's a youTube clipping demonstrating the layer-height material change technique:
I've added the gCode I made to this project so you can just use that if you like and your printer will pause for you to perform the filament change.
Good luck and happy printing!
The author marked this model as their own original creation.