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I seem to remember someone mentioning using a can of compressed air, which might be a good shout once a week or so.
Lezyne Micro Drive pump with an air blast jet on it instead of the valve adapter. Pump pump!
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The MC2 as we've already discussed is a pretty average machine and it's grind retention is another example of this.
I find you get best results when its already quite gummed up with old grounds inside. A clean MC2 will hold a couple of grams or more of grinds quite easily, but after a few days, those nooks and crannies get filled up. I then get to a point where if I put 17g in, I'll get 17g out, with a bit of pumping on the lid.
The key is, more pumping of the lid doesn't yield more grounds, suggesting the old grounds are pretty much "stuck" in there. Not ideal, but I'll live with it rather than spending £500 on a niche.
One thing I do find helps when single dose grinding is I put the old plastic tamper from my Classic on top of the beans in the hopper and use it to gently shepherd them through. This stops too much popcorning and speeds things up a bit.
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Jonny69
Scrabble
@Nef
MC2 users, what are your methods for avoiding ground retention?
I was initially just shaking the machine as it ran, which seemed to get the best results for coffee weight in/out, but it seemed a bit drastic and a touch mechanically unsympathetic.
I’ve since started “pumping” the hopper lid on and off during grinding and that seems to blow the grounds through quite happily. I seem to remember someone mentioning using a can of compressed air, which might be a good shout once a week or so.