Two videos. The first shows the head before and after machining. The other shows the machining process.

How willing are those people to a) charge another device and b) use another app?

Zone 7a I think. Eastern Europe, west facing.

Does it discourage from buying the same beans again? Or even from the same roaster?

What scales do you use?

Why is the cup in the freezer?

I believe cars and driving to be a huge drain on society for many reasons. That's not to say they aren't useful, but yes, we rarely drive and see directs benefits from it. I hope fuel rationing can keep key transport moving, but we'll see.