There is no plastic in the fluid/material path of either machine - it's virtually all stainless steel and silicone. Basically the only plastic on them is in the switches/electrical parts where is is almost impossible to avoid.

I think the plastics we have noticed to be harmful are only the ones that are the most obviously biologically disruptive or carcinogenic. Not sure anyone building anything now can confidently say that the plastic they're using won't be a problem later on.

I'm also slightly skeptical of aluminum when in contact with acidic fluids but that's a whole different thing.