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@thanksbye
Currently I've been using a Smart Grinder Pro, as not quite had the budget to upgrade to a single dosing.
I've tried a 3d printed single dose kit from Thingverse, it's got an almost bellows design.
Seems to be very good, circa .1g retention in an 18g dose. Well worth the £1 or so of filament.
Need to do it again in black, so if anyone wants a green one I'll happily ship on.