Why these numbers
Overture Matte PLA starts from Bambu's PLA Basic reference; Overture's published specs are overlaid where available, and everything else stays at Bambu's calibrated default.
TDS V5.1: density 1.30–1.31; highest-speed PLA in lineup
Treat these as a starting point — run a flow-test cube and Bambu's Flow Dynamics calibration after import for the last few percent.