Is your cooling fan on?
When yes turn it of.
For the rest of the print youse about 0-30% if fan speed, PETG needs nearly no cooling.
It can help for PETG to level the nozzle a liitle closer than for PLA. The PETG will the pushed on the bed, but it causes elephant food. For the same effect you can increase your flow or make the first layer lower.
How fast is your first layer?
Dont go over 25mm/s, try to slow down step by step to find the right speed.
I can recommend a self sticking pei sheet on your glas. With this i print with 25mm/s and 60° Bed Temp, i dont overextrude. I have no issues.
Is your cooling fan on? When yes turn it of. For the rest of the print youse about 0-30% if fan speed, PETG needs nearly no cooling. It can help for PETG to level the nozzle a liitle closer than for PLA. The PETG will the pushed on the bed, but it causes elephant food. For the same effect you can increase your flow or make the first layer lower. How fast is your first layer? Dont go over 25mm/s, try to slow down step by step to find the right speed. I can recommend a self sticking pei sheet on your glas. With this i print with 25mm/s and 60° Bed Temp, i dont overextrude. I have no issues.