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

You will need an adhesion brim (8 to 10mm) to print the rails vertically.

No brim needed for the end caps and the hangers.

Layer height: 0.2mm/layer
Wall line count: 2
Infill: 15 to 20% (honeycomb on the pictures)
Build adhesion type: 10mm brim
Supports: None