Place it in hot water and it should return close to its original shape.
Yeah, my major qualm about 3D printing is that all of the plastics I would like to use are higher heat than any entry level printers.
PETG works fine in the dishwasher and works on any standard printer.
PETG is a good argument against my statement, but it still prints at a temperature between 220 and 260 C. PLA prints at 180 to 220 C.
PETG is a higher temperature plastic than PLA, and a lot of cheap (below $200) printers don’t work well with it.
Old Ender 3s and the like work just fine with PETG. Not sure where you got the impression they don’t.
There’s nothing special about printing PETG that requires a big change over PLA. Printers have been hitting those temps since the rep rap days.
Personal experiences with a cheap sovol that turned itself off when the temperatures went up during a long print.