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Well... technically is called annealing, but who cares about technicalities?

I have seen videos about annealing, why, how and what for.

PLA for instance gets better heat resistance if annealed in low temperatures (80 to 100 Celsius) and improves in strength a lot if annealed at 125 Celsius for 30 minutes or more, almost double it/s mechanical resistance.

However a dude on YouTube found a different method works as well and is quicker, dip it in boiling water for 5 minutes, than dip it in cold water, sort of metal like treatment.

It worked fine with PLA, I would compare other materials too, as PLA is OK to test a concept, but than you must us the real deal for the final part.

I have printed today PTEG plus Carbon Fiber, and to anneal it I also printed a cup, turn it upside down, on the printing bed, turn it on at 110 Celsius, placed my part underneath, and ... it works.

However the Prusa team did a more extensive job thou they missed some materials I am interested in.

If you run a YouTube search like this one you might find more people baking for fun their filaments