Model:

Colorful Caps / Covers for the 4 Screws in the frontdoor of the BambuLab X1C

Simply put it over the screws.

PETG is recommended because of the camber temperature.
PLA could start to deform and fall of

Note:

Depending on your calibration and used filament it could be that you have to up or downscale it a little bit.
With my setup it fits perfect