This is a simple rooftop made out of plastic tubing (fi16mm) for electrical cables. 

Material: PETG

Perimeters: 4 - 0.6mm nozzle

Infil: Gyroid - 20%

Layer-hight: 0.32mm

These are the settings I used but feel free to experiment. Just keep in mind that the bend tubes will put some force on the fittings when bent. So don't make the walls too thin and maybe adjust the printing position of them so that the vertical parts of the fittings lie flat on the bed. Otherwise, I recommend reducing the layer height because of the delamination. 

After printing, I joined the tubes and the fittings with some self-tapping screws (see pictures).

Hinges are optional, clip 2 can be used instead, this enables you to open the roof from both sides.