The filament suggestion link on that page goes to AmazonBasics White PETG in 2.85mm. I'm not sure how your Prusa i3 is configured, but my MK3S+ takes 1.75mm and I would guess that for most users, this is the correct size. I suggest adding a link to the 1.75mm version.
https://github.com/aderusha/HASwitchPlate/blob/master/3D_Printable_Models/README.md
The filament suggestion link on that page goes to AmazonBasics White PETG in 2.85mm. I'm not sure how your Prusa i3 is configured, but my MK3S+ takes 1.75mm and I would guess that for most users, this is the correct size. I suggest adding a link to the 1.75mm version.
For clarity, the links in question are:
https://www.amazon.com/AmazonBasics-Printer-Filament-2-85mm-White/dp/B07SZLZG5G https://www.amazon.com/AmazonBasics-Printer-Filament-1-75mm-White/dp/B07T6W63MY