Excessive stringing, oozing, and whistle bridging fail with stock SD files.
 
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Excessive stringing, oozing, and whistle bridging fail with stock SD files.  

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Jimmy Chapel
(@jimmy-chapel)
New Member
Excessive stringing, oozing, and whistle bridging fail with stock SD files.

I just recently assembled my MK3S from the kit, and have been struggling with these issues. All of these prints are using the stock SD files and  included PLA Silver filament. I have carefully set my first layer height, and calibrated the PID. I preheat the nozzle and clean the bed before every print. I've tried turning down the temperature to 205°C during prints, but the issues persist.

Any help is greatly appreciated.

Posted : 22/03/2020 1:52 am
Jimmy Chapel
(@jimmy-chapel)
New Member
Topic starter answered:
RE: Excessive stringing, oozing, and whistle bridging fail with stock SD files.

I ran the majda107's printer test overnight, and this better illustrates my issues.

Posted : 22/03/2020 4:53 pm
bobstro
(@bobstro)
Illustrious Member
RE: Excessive stringing, oozing, and whistle bridging fail with stock SD files.

You are trying to shotgun troubleshooting, which makes things difficult. First of all, can you summarize your settings? Better yet, zip and upload a copy of your 3MF project file so we can see what settings you're using. A few notes on what I can see in the pictures:

  • Try using a modest 0.2 or 0.15mm layer height before going for broke with 0.1 or finer.
  • The little squiggles in the corners of the PRUSA logo are from wiping, an anti-stringing measure. You can disable Printer Settings->Extruder 1->Retraction->Wipe while retracting to reduce those, although this may contribute to stringing later.
  • The overhangs are intended to show the limits of the printer. Expect rough undersides near the top. That is the purpose of the test. You can work with temperatures and cooling to improve the results, but do not expect perfection.
  • The inconsistent vertical poles may benefit from slowing down speeds.

Try some smaller and faster test prints to isolate specific issues.

I'd look at doing extrusion rate calibration. This may help with stringing overall as well as surface consistency. Any over-extrusion is going to show on vertical surfaces and contribute to stringing. I've got more notes here that might be helpful.

My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 23/03/2020 4:53 pm
Jimmy Chapel
(@jimmy-chapel)
New Member
Topic starter answered:
RE: Excessive stringing, oozing, and whistle bridging fail with stock SD files.

Here is my 3MF file for majda107's printer test, using 100% infill and no supports as specified in the instructions. For all of the other objects, I am using Prusa's unmodified .gcode files included on the SD card.

3D_Printer_test_fixed_stl_3rd_gen

Posted : 24/03/2020 1:49 am
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