Weird outline that is not existing in GCode – Hardware problem?
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Can you save that sliced file in Cura as a 3MF and post it for download? I'd like to see your Cura profile. What's the extrusion width?
I actually think it might be from printing too slow. When it's making corners so slowly, it's keeping the filament warm and soft and the friction of the nozzle has a tendency to pull it along. This is also a very small part so it doesn't get much time to cool down and solidify.
I also dislike that cura defaults to printing infill first. It has too much of an effect on the surface. I also rarely use more than 2 perimeters. All the little errors from each perimeter starts to build up. So in your case you have infill acting as a first perimeter, and then 3 more.
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My suggestions:
- Try setting the slicer to "external perimeters first". This usually produces more accurate perimeters.
- Use a lower printing temperature.
- Use more print cooling.
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@phaedrux @dc42
I uploaded the files here (an xyz cube, a *.3MF file for it from Cura 4.1.0 and the GCode, all for 40mm/s at lowest temperature possible with 0.2 mm layer height using a 0.3 mm nozzle).The prints all are made with line width of 0.3 mm (was recommended default setting from Cura for 0.3 mm nozzle).
The print is printed walls before infill (I was wrong at this!) and with inner walls first.I printed the same cube again at 5 mm/s (~1.5h to that level) and at 40 mm/s (< 10 min to that level) as it can be seen in the following image (click to see details).
That the problem is present the same at the picture independent to the print speed indicates that the low speed is not the problem here.- list item"External perimeters" first will cause bad overhangs (had that before), but I will definitely test it in the next run again.
- I can't go lower with print temperature as the nozzle will clog even at 1mm/s extrusion without part cooling fan on.
- The cooling was my initial idea. I've tried it with an air pressure gun from my painting compressor at first, blowing into a flexible tube fixed to my main part cooling fan. While it was fun testing, my wife wasn't impressed by the noise, the print wasn't either. No visible difference except increased stringing and an angry wife.
So far, thank you very much for your support!
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@ted said in Weird outline that is not existing in GCode – Hardware problem?:
0.2 mm layer height using a 0.3 mm nozzle
Try a lower layer height. 0.1 or 0.15.
Alternatively try a wider extrusion width, 0.4 for example.
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I'm also suspecting mechanical issue. Loose belts?
Have you tried printing any other models? Something a bit more complex? Benchy perhaps?
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It looks like Cura has acceleration control enabled and set to M204 P1500 so definitely higher than what you have in config.g. Try disabled acceleration control for now and control it via config.g. You can experiment with changing it mid print by sending different M204 P values to see the effects.
