Background:

I am running a mostly stock flsun Super Racer, which had been running pretty well on Marlin. I was having a few problems with print quality at high speed, and in an attempt to improve this I bought the flsun Speeder Pad, flashed it with stock klipper, and got it all up and running. So far so good.

I have been trying to get rid of an annoying stringing issue that I never really had on Marlin, and the more I try to remedy it, the worse it’s getting.

The image is from my latest retraction tower test after re-calibrating pressure advance and rotation_distance. I’m really not sure where to go from here.

Settings from the above test:

  • Esun PLA+
  • 220C (for maximum flow)
  • 1000mm/s acceleration (low for a delta)
  • 0.1mm z-hop on retract
  • Firmware retract control running in test tower mode, 0mm start, 0.1mm factor
  • Pressure advance of 0.236

Upgrades from stock:

  • Lighter hotend housing
  • Deported fans
  • Fan ducts

Any advice is greatly appreciate!

UPDATE: It was the filament. I grabbed a spool of grey from my drying cabinet, and only later (after much hair pulling!) realized it was the budget filament I’d bought to try. Switched it out to some good quality esun PLA+ and the stringing practically vanished! See image for final stringing test.

Final retraction settings: 3.5mm at 35mm/s.

I would like to thank everyone for their help! Lemmy is always the best place to get advice!

  • @[email protected]English
    1•8 months ago

    Ugh, I’m also having the problem. I’m using eSUN PLA+ in black and white. I’ve even dried them out 12+ hours and store them in a waterproof box with desiccant.

    I’m at my wit’s end trying to figure out why it’s stringing so badly. None of my other rolls before these did it.

    • @RangelusOPEnglish
      1•8 months ago

      What temperature are you printing at? When I was using Marlin I ran mine at about 200, and could probably have gone even lower. I also tuned linear advance which made a big difference.

      I have found that some esun spools weren’t particularly dry when I got them. They sit in my dehumidifier which sits at about 20%, so they get dry eventually.

      You can try coasting as well I think.