Thermador OEM knob 00189011 (also listed as 189011) runs $29+ per knob — and Thermador parts have a habit of going unavailable. Print a compatible replacement with the exact bore for your valve stem.
Shaft fit: D-shaft — pull a knob and verify 6mm vs 8mm before ordering. Knobulator lets you set the exact bore
shape and clearance, so the knob grips the shaft instead of spinning — the usual failure of
one-size-fits-all replacements.