A little more room on your desk.
Measure your table and headband. The model updates as you go.
Add recessed dots above the table, below it, or on both contact faces.
Interference is measured at the contact surface: the silicone dots when enabled, otherwise the printed pad. Start with 0.8 mm; reduce it for a tight fit.
Millimetres · flat on its side · no supports
Use PETG, 4–5 walls and 30–40% infill as a starting point. The thin lower jaw provides spring grip; the thicker spine carries the headphones.
Grip and load capacity need a physical test print.