The first time I tried PETG with my Ender 3 V2 the PTFE tube melted down and I ended up making a huge pile of spaghetti. It got nasty. I'm having better luck these days now that I have Micro Swiss hot end. The Ender is still a piece of junk though, and I didn't even pay for mine. I got it basically for free by trading old PC parts (thanks Covid). Someday I'll buy a Prusa or something.
I like that socket knob. I am going to make a few of those.