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Perfect size for my coffee area. Strong and works great. I took a chance because I had seen a video somewhere that said a knock box is no use when you have a pressurised portafilter basket. Not true at all. A couple of taps and it comes out like a puck. Nice and clean.
So it has a knock bar - the instructions say to knock the portafilter handle on it - like any other product of this type. The bucket is so tiny that this is impossible with any portafilter on the market - you have to knock the basket against it, which is obviously a terrible idea and grinds go flying everywhere.
This is the kind of stupid product the internet invents because it looks good in a picture, but if you saw in an actual shop you'd instantly know it was useless. It should never have been manufactured and if serves no purpose.
If you are from a dwarven or hobbit realm and you have a sub-30mm portafilter it might work for you?
A compact knock box. The price you'd pay for the compact size is... its size. It is pretty small, I find it impossible to knock out a brew head without splattering some liquid and grounds around the box. Two inches extra diameter would be perfect.
I wish I'd designed this gadget which must cost pennies to produce in China. So does it work? No! Bashing my 58mm basket sends leftover water and coffee flying back at me and somehow, it needs several bashes which, with coffee already in the container will send more coffee exploding around. So you end up spending more time wiping and cleaning than it'd take to simply tap the coffee out in the bin! With more thought I can see something similar possibly working (before the whole thing falls apart after a year or so depedning on use) but this is definitely an early work in progress which we are paying for ;-( As the dragons would say: I'm out.
I have found after three coffees, I have to empty out the knocking box as it has a tendency to over spill of coffee grounds. If it happened to be slightly larger it would allow the blocks of coffee from basket to go under nocking bar.
It's well made, and very sturdy but rather too small. It kind of warrants it's place but, all things considered, I wouldn't buy another. It's cunning design guarantees an even distribution of coffee grounds across your kitchen worktop. Ho Hum.
This product is much smaller than I thought. My old box was much bigger. Coffee grinds go every where if you hit with any force and just tapping doesn't really work. Disappointed a bigger version with a higher back would be perfect.