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Songkick? I’ve been using it for a few years and it works reasonably well. I believe you can connect it to Spotify too. The only negative is it’s usually 3-5 days behind the announcement of shows. Following the artist directly is still the best bet to guarantee you hear it straight away. But that’s only a problem if the show/artist is super popular and sells out fast.

This was the info I was interested in.

Finely ground (espresso) coffee grounds were dried in the sun and then sifted. Then mixed with binders (xanthan gum and carboxymethyl cellulose powders) and water. These are printed in a modified consumer grade fdm 3d printer using a syringe instead of the hot end. The resulting material is claimed to be as strong as unreinforced concrete, but is biodegradable.