Jonk wrote:On my Mahlkönig Guatemala the stationary burr was noticeable more worn towards the lower section, so orientation can have an effect. But those burrs are at a 90 degree angle, most likely the differences due to the 10 degrees discussed here is quite minor.

This comment in another thread brought up an aspect that I never thought of before. It seems the lower part of the stationary burr could wear out much faster because it grinds more coffee than other parts of the burr set. Steeper angle and lower RPM would make it more uneven. This combined with light roasts which tend to wear out burrs faster, I could imagine reduction of burr lifespan by a big factor (10x ?) compared to the best-case scenario (horizontal orientation + medium/dark roasts).

Any thoughts?

Rotating the fixed burr is part of regular maintenance. In addition, in some grinders the fixed and rotating burrs can be flipped.