I print with PETG and I have an Ender3 and Maker Select v2. I would check the print bed temp (I print at 80c for PETG and 240 at the nozzle with Overture PETG on my Ender).So I had an epic fail with my 1st PETG print last night. None of the slice layers it here to each other. I never went back into the computer program and change settings. I was doing it all in the Ender and it did not turn out good. I will try again when I get home from work. Watched a few videos this morning saying bed temperature of 50 Lift and nozzle temperature at 240 to start.
Also check your slicer settings. Which slicer are you using? (Sorry if you have stated this already I jumped to the end of the posts)
Happy to help with 3D printing stuff, been doing it for a long time. Just call me out so I get a notification .
side note: people with Ender3, have you seen the new ‘silent’ motherboard? $35 on Amazon. It is literally dead silent with those new drivers. All I hear are the fans running. Just thought I would throw that out there. It’s not a needed ‘upgrade’, but I had a capacitor blow on the E motor with the original board.