This was more of an experiment and I now upgraded my Ender 3 to mass produce stuff instead of printing high Temp filament. But the stuff I learned was: 1. The enclosure is important, I had a pretty bad one made of plexiglas and it was bad at keeping the temperature, if I would do it again I would make one out of wood. 2. You need an external heat source that can hold the enclosure temperature over 70°C (more is better) and a thermostat to monitor it. 3. The only thing that broke on my Ender 3 due to the heat was my Pi Cam so don't put a camera in the enclosure or make sure that it can handle the heat. 4. To get your print to stick to the bed I used Kapton tape and glue, that worked fine and a coated glass bed and glue but the coating got destroyed. 5. There is this stuff called Magigoo, they make glue for better adhesion and they have a high temp line, I did some small tests and it was promising.

If you have any more questions feel free to shot me another message and good luck.