I noticed this article about some research using thermoset polymers (e.g. epoxy is a thermoset polymer) to do 3D printing. What’s amazing is that you can often print without support, and also (I think) it doesn’t even require a heated nozzle.
I think it’s still in the research stage. You know how universities work - they do some research, someone earns a master’s degree from it, then it’s just a paper for someone to exploit later, unless there’s a patent, generally owned by the university to provide them with some income. But at least the idea is out there, if not the exact formulation of the polymers. The full paper is available for some $, unless you have a membership already.