Commercial printers by Carbon use a patented method called “continuous liquid interface production” (CLIP), with resin printers by other companies using a variety of other (also patented ...
A resin heater is one solution, and there are many DIY options using simple parts. Some of the newer (and more expensive) printers have heaters built in, but most existing hobbyist machines do not.
I have a cheap resin printer and some DIY copper/nickel electroplating baths. In this video we see if we can recreate their result, and work through the challenges of COTS materials. Trump issues ...