Top layer bulging/flaring - 0.6mm nozzle
I recently started using a 0.6mm nozzle because I was having clogs with a 0.4mm nozzle when printing wood filament. When running some test prints I noticed that the top layers are bulging/flaring out. The print in the picture is supposed to have a flat sidewall. I've tried adjusting the extrusion multiplier using the 40-40-40-cube printed in vase mode, but it doesn't seem to make a difference. This happens with both the wood and regular PLA filament. I'm using the built in Prusa 0.6mm nozzle printer settings and 0.2mm DETAIL print settings. Any ideas?
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You might try changing the upper ridge to be closer to the actual extrusion width. With a 0.4 mm nozzle, at 2.0 mm, it will be tough to find a 0.45 mm divisor that works well. Same would apply to a 0.6 mm nozzle: Try adjusting the lip to some even multiple of the perimeter width; or reduce or increase the perimeter width in Slicer to match the dimensions you want.
RE: Top layer bulging/flaring - 0.6mm nozzle
Suggestions:
- Try simply slowing way down. Dial speed back to 50% mid-print using the front knob.
- Try adding a perimeter layer. More thickness will result in a more even wall surface.
- Thicker filaments won't extrude at the same rate as others. Very often you have to dial the Maximum volumetric speed setting down considerably to get good prints.
Provide a summary of your settings or (better) a 3MF project file with your part and settings (you need to zip the file before uploading) and more ideas are likely to be forthcoming. Also note what filament you're using.
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RE: Top layer bulging/flaring - 0.6mm nozzle
Thanks for the suggestions, I will give them a try. When you say add a perimeter layer do you mean the setting under Layers and perimeters/Vertical shells/Perimeters?
I've attached my 3MF file. I'm using Hatchbox wood pla.
RE: Top layer bulging/flaring - 0.6mm nozzle
Yes, vertical perimeter (wall).
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He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan
RE: Top layer bulging/flaring - 0.6mm nozzle
[...] I've attached my 3MF file. I'm using Hatchbox wood pla.
It may be a day or two before I can really check this out. I've got some eSun wood PLA I can try it with. If somebody else doesn't give it a try, bump me back in a few days. In the meantime, try those settings I recommended and see if it improves.
Quick thought: Have you tried with non-filled PLA? Do you see the same bulges? Lesser bulges? That might give some hints.
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He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan
RE: Top layer bulging/flaring - 0.6mm nozzle
You might try changing the upper ridge to be closer to the actual extrusion width. With a 0.4 mm nozzle, at 2.0 mm, it will be tough to find a 0.45 mm divisor that works well. Same would apply to a 0.6 mm nozzle: Try adjusting the lip to some even multiple of the perimeter width; or reduce or increase the perimeter width in Slicer to match the dimensions you want.
RE: Top layer bulging/flaring - 0.6mm nozzle
Ah, that makes sense. I changed the model to have a 2.6mm ridge and that resulted in a nice straight wall. Thanks!!
Just out of curiosity did you measure the ridge in Prusa Slicer or did you extract the STL into another program? I haven't seen any way to measure in Prusa Slicer.
RE: Top layer bulging/flaring - 0.6mm nozzle
I used Plicer ... but in a very convoluted way: I added a part and resized it until it visually matched. There are probably a lot of better ways to do that type of measurement.