Print the Front Y Axis  

Hair spray? How barbaric. 

I actually just printed two copies (with dual color) of the front y plate yesterday, using Prusament PETG orange and black. No problem. 

If a) you've cleaned the sheet thoroughly with hot water and soap and b) your first layer calibration is good, I wouldn't expect adhesion issues. 

Here are a few approaches that have worked for me for warping of large rectangular parts:

• Slow down print speed.
• Add mickey mouse ears to the corners. You can add a cylindrical part in PrusaSlicer, maybe 10mm diameter, change height to single layer height, then place the part at the corner. Repeat for each corner.
• Add a brim around the model, 5 mm or more.
• Use Layerneer Bed Weld ( https://www.amazon.com/Printer-Adhesive-Layerneer-Original-Filament/dp/B079984GV5/). You only need a thin layer.
• If you have design control over your part and it's possible considering the intended use, you can try to round the edges and/or add holes to the base of the model. Clearly not applicable here. 
• Combination of above.

Print the Front Y Axis

Thank you, I will use th brim and slow down the speeds

Print Y plate Front

Hi

Last question. Fan speeds first layer  and then maximum fan speed during the print. I read as much as I could on PETG . I think fan is on 30%

Regards

Joss

Just start with the Generic PETG or Prusament PETG profile in PrusaSlicer. It'll set the fan speed to what PETG needs.