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Thanks for this.
It prompted me to check the burrs on my giant Fracino grinder. Turns out I could run my fingernail along the edges without much resistance so I guess they're pretty worn. I learn the Fracino is a rebranded Cunill with 59mm burrs and get replacements which aren't sharp but they bite a bit.
First dialed in shot today and placebo or not it's a dramatically better. I think this might also be down to me realising how much I need to purge. On taking it apart I found what looks like about 15-20g sitting in the grinder, yuck.
After fitting with an empty chamber I got 10g less out than I put in so I guess I have to purge about 10g every time. No more variety bean subscriptions for me, I getting one bean and sticking to it!
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neu
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It’s usually worth replacing the burrs on a used commercial grinder as soon as you get it unless you’re sure it’s been lightly used. Once you’ve done that they should last a lifetime in domestic use. Replacement burrs for that machine are not much money. Give me a shout if you have any trouble sourcing them.
Blunt burrs produce less definition of flavour, but you won’t know until you change them because it happens incrementally. Also they grind slower - if it’s taking more than about 10 seconds to grind a basket full then they’re probably dull. You’ll notice it sounds better when you change them if they’re blunt.