Why these numbers
Amazon Basics PETG Filament 2.85 mm starts from Bambu's PETG Basic reference; Amazon Basics's published specs are overlaid where available, and everything else stays at Bambu's calibrated default.
Same params as 1.75 mm PETG; 3 ASINs (B07T4X4RQH, B07SZLZG5G, B07SZLZ241)
Treat these as a starting point — run a flow-test cube and Bambu's Flow Dynamics calibration after import for the last few percent.