PETG Print Quality Help

Trying to improve print quality with my Custom COREXY machine
Running PETG at 255 degrees, with 70 degree PEI Bed
I have also run at 235 degrees with similar print quality

Extruder is a Bondtech Mini Direct Bowden
Bowden tube is aprox 400mm

E3D V6 Bowden 1.75 with .4mm nozzle

Simplify 3D Settings

.40mm
.89 Extrusion Multipler
5.5mm retraction
-0.1 Extra restart Distance
0 Retraction lift
60mm/sec retraction speed
1mm Coasting
3mm Wipe Distance

.25mm Layers
3 top layers
3 bottom layers
3 Perimiters

30% Fill Honeycomb full
100% infill width

80mm Sec Speed
80% outline speed
80% infill speed

1.71 Filament diameter
Bridging extrusion multipler 90%
Bridging speed multiplier 110%

Perform retract duding wipe movement - enabled
only wipe extruder for outer most perm - enabled
Avoid crossing outline for travel Max allowed = 3mm

any tips would be appreciated

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Makerparts.ca
Your Canadian source for V-Slot Extrusion, CNC and 3D Printing Parts and Accessories.
we are proud to be an official Openbuilds distributor.

Pet oozes a lot. Try to find the coolest you can print is my recommendation as a first step.

I tried lowering the temp but i find layer adhesion is best around 250

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Makerparts.ca
Your Canadian source for V-Slot Extrusion, CNC and 3D Printing Parts and Accessories.
we are proud to be an official Openbuilds distributor.

i think you can move down to -10c and then lower the speed . The layer adhesion will be similar but the material will be coolest so it wont ooze less.

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Delta Printer
Duet 0.8.5 firmware 1.19

I have printed pet at 190 to 210 @40mm/s with .1 and .2 layer heights. I found that printing at higher temperatures caused more oozing and my prints to be extremely brittle. If you are having problems with layers delaminating it could be do to the extrusion multiplier, I read that using the multiplier instead of adjusting e steps can cause prints to be weaker and the layers to not stick as well.

I use a mk7 direct drive extruder though so I do not know how helpful my experience really is.

I have printed pet at 190 to 210 @40mm/s with .1 and .2 layer heights. I found that printing at higher temperatures caused more oozing and my prints to be extremely brittle. If you are having problems with layers delaminating it could be do to the extrusion multiplier, I read that using the multiplier instead of adjusting e steps can cause prints to be weaker and the layers to not stick as well.

I use a mk7 direct drive extruder though so I do not know how helpful my experience really is.