[He doesn't look up - he has the top off a hotel coffee machine, and is tinkering with the insides with a jeweler's screwdriver and a tension wrench, hunting for the temperature controls or a way to jury-rig them.]

It burns everything. Heats too much, too fast, doesn't allow a steady drip rather than a flood, so you get a mix of burnt coffee and hot brown water, and it all turns into acid tar. We might be better off strating from scratch...