I just broke my cardinal rule of only having one espresso machine open and out of service at a time.

If you want to see the horror show that was the "before" state. Snapped off copper dip tube, up to 1/8" thick limestone deposits in places, and covered with blackened debris.

This is what the interior of this boiler looks like.

I'm excited to have completed the rebuild of this espresso machine boiler and group head. Next up is to automate this with some simple rust and a custom PID.