Cafelat
Cafelat isn't a "plastic-free" brand by mission, but the Robot is built the way plastic-avoiders want: the brew path is stainless steel and food-grade silicone, the body is powder-coated die-cast aluminum, and Cafelat states there is no plastic anywhere in the machine. Hot water and coffee touch only steel and silicone.
How clear are their specs?
Cafelat states the Robot's brew-contact parts are stainless steel with FDA-approved silicone gaskets and that there is no plastic in the machine.