3D PRINT SETTINGS:
All STL files are all already oriented properly.
No need for supports, or brim.

The hangers print on their side and don't need support, even for the overhanging part.

Layer height: 0.2mm/layer
Wall line count: 2
Infill: 15 to 20%
Build adhesion type: None
Supports: None

To get a 2 colour print like on the pictures, you can schedule filament changes (or pauses to change your filament).
For my version, I printed in 0.2mm/layer:

• the 2 first layers in black
• then wood PLA up to layer 37
• then back to black until the end.

in CURA go to:
Extensions > Post Processing > Modify Gcode > Add Script > Filament Change
And in there you input the layer where you need the filament change to happen.
Slice your model once again so it updates your Gcode.
And there you go! Ready to print!

In Bambu Studio, after slicing, scroll the layer scroller on the right of the screen until you reach the layer where you want the filament to change.
Right click on your mouse and hit "pause" to schedule a filament change at that layer.