Real-world scale
The problem
AR viewers interpret one model unit as one meter. Models exported in centimeters or millimeters show up 100–1000× too large or too small when placed in a room.
The fix
Apply real-world scale before export and verify units are meters in the exporter settings.
Check your model now
The free AR Readiness Auditor tests this (and 15 other failure modes) right in your browser — your model is never uploaded.