Numbers from tests somebody else ran: filament strength, printer speed and accuracy, teardowns, with who measured them, how, and what they could not test.
CNC Kitchen tested micro-non-planar "Z anti-aliasing" slicing on a Voron 2.4, measuring Ra drop from ~80 µm to ~25 µm on a 5° wedge with a Mitutoyo Surftest SJ-220.
My Tech Fun ran the UGEE FunBox, a €299 kids' printer with a 120x120x120mm build volume and an unheated "room temperature" platform, through its app workflow and spool swaps.
My Tech Fun tore printed samples of IPCON's glass-fiber and carbon-fiber PPA filaments on a scale rig, logging four separate breaks at 164.2 kg, 197.3 kg, 245.8 kg and 407.6 kg without labeling which pull belonged to which grade on screen.