Material is decisive
PLA turns brittle outdoors. ASA and PETG do better, and ASA is the strongest choice against UV.
Colours fade
Dark colours usually keep their look longer than bright, saturated ones.
Winter
Bring smaller items indoors over winter if you want them to last several seasons.
What we do not promise
We do not promise a specific outdoor lifetime. We can make a test print and follow up after a season.