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External Perimeter Vertical Walls Flaking  

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Sharpee
(@sharpee)
Active Member
External Perimeter Vertical Walls Flaking

On most of my initial prints for the enclosure (see more here: https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/factory-reset-slow-extrusion-of-filament-95100-flow ) this has happened. (See image below)

I have increased perimeters and also increased extrusion width for external & default perimeters. At the moment, the print has improved quality 3x, although I am still having trouble with the external walls flaking and not attaching to the internal perimeters.

The next print, I am going to increase extrusion width from .45mm to .55mm; on PrusaSlic3r the external perimeters noticeably have increased, although we will see results on the next print.

For semantics, I currently have:

  • .4mm Nozzle
  • Flowrate: 115-120
  • Nozzle Temp: 250-255
  • Bed Temp: 85-90
  • Infill: 25%
  • Material: Prusament PETG
  • Room Temp: 75F
  • Humidity: 50%
  • Filament Age: < Week

This topic was modified 5 years ago 2 times by Sharpee
Posted : 19/10/2019 6:41 pm
Sharpee
(@sharpee)
Active Member
Topic starter answered:
RE: External Perimeter Vertical Walls Flaking

Update:

Increasing perimeters only creates an onion type effect for the vertical walls/shells. The only other option I have not fiddled with is the infill/perimeter overlap.

Has anyone else discovered the same results or is it only me?

Posted : 20/10/2019 2:24 am
Sharpee
(@sharpee)
Active Member
Topic starter answered:
RE: External Perimeter Vertical Walls Flaking

I changed perimeters to one and now we are groovy. Super strong Prusa Research quality part.

Posted : 22/10/2019 4:04 am
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(@)
Illustrious Member
RE: External Perimeter Vertical Walls Flaking

Have you inspected that volumetric flow rates are within normal PETG limits?  PETG intralayer adhesion problems are usually speed related.: print to fast and bonding strength suffers.

This post was modified 5 years ago by --
Posted : 22/10/2019 6:33 am
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