Why these numbers
Overture PETG starts from Bambu's PETG Basic reference; Overture's published specs are overlaid where available, and everything else stays at Bambu's calibrated default.
TDS V5.2: density 1.30; Vicat ~85 °C; over-drying causes brittleness
Treat these as a starting point — run a flow-test cube and Bambu's Flow Dynamics calibration after import for the last few percent.