A simple rail to hide some cables

can be used as a clip or as a full rail.

Print on its side,

Add mouse ear brim

Adjust in slicer to your height needs in slicer either scaling or with negative part modifier

Printed with TPU 80A
Layer height: 0.2
Line width: 0.5
Nozzle 0.4
Walls: 4
Infill: 15%
Pattern: gyroid

Although easily can be printed with PLA or PETG on any nozzle/settings
For TPU walls,infill/pattern settings will impact on hardness of the end detail

No supports needed
After print: stick with double-side duct tape