It was a nightmare to print with PETG but in the end, thanks to Thomas Sanladerer and his video - Things you should know about PETG - https://www.youtube.com/watch?v=8_adY2K-YIc, I made it!
The issue was that the first layer won't stick to the glass. The solution was to use Masking Paper Tape and Gluestick.
Amazon Basics PETG
- wall line count: 2
- print speed 70mm/s
- first layer do it very slow: 10mm/s
- regular fan speed:30%
- maximum fan speed: 50%
- build plate adhesion: brim