RepRap (and other) FFF 3D printers have had heated beds to ensure prints don’t peel off for a long time. I think they were invented by Chris Palmer (Nophead) in 2010. They have also had magnetic beds to hold
RepRap Solenoid Bed Heater

RepRap (and other) FFF 3D printers have had heated beds to ensure prints don’t peel off for a long time. I think they were invented by Chris Palmer (Nophead) in 2010. They have also had magnetic beds to hold