This advice fixed it for me. it is just a guide and you may not use cura. But I no longer have any stringing with PETG. Well, maybe a wisp occasionally. B-)
Stringing with PETG can be quite challenging to eliminate, but with the right settings in Cura, you can significantly reduce it. Here are some specific settings and adjustments to consider:
Retraction Distance: Increase the retraction distance. For the Ender-3 V3 SE, a retraction distance of around 4 to 6 mm can be effective for PETG. Be cautious about going too high, as it can lead to other issues like clogging.
Retraction Speed: Adjust the retraction speed. A speed of 40-50 mm/s is a good starting point. Fast retraction speeds can help prevent oozing and stringing.
Print Temperature: You're already printing at 230°C, which is within the typical range for PETG (220-250°C). However, sometimes reducing the temperature by 5-10 degrees can help reduce stringing, as long as it doesn't affect layer adhesion.
Travel Speed: Increase the travel speed. This minimizes the time the nozzle spends traversing open spaces, reducing the chances of stringing. Try setting it to 150-200 mm/s.
Cooling Fan Speed: PETG doesn’t require as much cooling as PLA. Try setting the fan speed to around 30-50% after the first few layers. Too much cooling can cause PETG to solidify too quickly, leading to stringing.
Z-Hop: Enable Z-Hop when retracted. This lifts the nozzle slightly when moving across the print, which can help reduce strings. However, use this sparingly, as too much Z-Hop can lead to other issues.
Combing Mode: Set the combing mode to "Not in Skin". This prevents the nozzle from traveling over outer surfaces and potentially leaving strings.
Print Speed: Slower print speeds can sometimes help with stringing, as they allow more precise control of filament extrusion. Try reducing the overall print speed to 40-50 mm/s.
Layer Height: Using a slightly larger layer height can help with stringing because it results in less pressure build-up in the nozzle. A layer height of 0.2 mm is a good starting point.
Remember, every printer and filament combination can behave differently, so these settings should be considered a starting point. You may need to fine-tune these parameters based on your specific printer and the PETG filament you are using. Small test prints like temperature towers or stringing tests can be very helpful for dialing in these settings.