eSUN PETG +HS - my settings improvments for overhangs

[Berioldir]

Hi there,

I just wanted to share my little experiment. Perhaps it will help you when using eSUN PETG +HS (high speed).
I used the default settings provided by eSUN considering the material properties and the slicing process. I did not dry the material, just used it “out of the box”. First of all I did a stringing test - result: zero stringing, so moisture didn’t seem to be a problem. Yet, I had massive problems with overhangs, so I printed an overhang test: Left Part

Then I searched the PETG issue on the bambu lab forum. There are a lot of recommendations like:

• not enough cooling
• too high printing speed (outer wall)
• deactivate “slow down for overhangs”
• dry your filament

Changed part cooling min from 10 → 40% and max from 40% → 90%
Massive improvement: Middle Part

Additionally I changed the printing speed. → deactivate “slow down for overhangs” and set outer wall speed to 60 mm/s
Almost no improvement: Right Part

In the end it just was the part cooling.
Probably you can even tweak it further, but so far I’m satisfied being able to print a 45° overhang.

[drakko]

could you share with us some shots of your customized settings?

[Berioldir]

As already mentioned, it’s just the eSUN standard profile they offer you to download. Just changed the fan speed.

If you slice with the standard profile, the overhangs will indeed be printed with a 90% fan speed, but that’s ONLY the overhangs greater 10%. The first inner wall, for example, will be printed at the slow fan speed and that is not sufficient for large overhangs.
So my adjustment leads to the whole part being printed at 90% fan speed which is also not ideal, since it has a negative impact on strength.

I hope there sometimes will be an slicer improvement, which sets the fan speed higher for the walls that are two or three away from the overhanging outer wall, so the rest of the part can be printed with the lower fan speed setting, improving strength.