Coffee Shops

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Mazzer Robur conical burrs

What the usefull life of a set of Mazzer Robur conical burrs? I was told it was 1,600 lbs. but just replaced them after 1,200 lbs. due to typical signs of burr fatigue. A bit disappointing but mainly need to know what to plan for. Please share.
 
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    Flavia Celidonio Pogliani

    Could be a problem either with the burrs, or the whole grinder, or with the beans you've using (too hard, too dense), or with the staff who is operating the grinder...