First of all, I'm quite new to 3D printing. After printing some temperature towers, stringing and bridging tests, I wanted to print the Bechys to see everything working together. I'm getting some strange "bumps" in the outer walls. It looks like for 2-3 layers, the filament gets lifted up.
I first thought, the infill is printed too far in the outer shell, so I unchecked "Infill Before Walls" in Cura. Surprisingly the outcome did not change and the "bumps" where in the exact same spots as before.
I am aware of a part cooling problem, but my stock cooler already sits at 100 %. I don't think, the extruder temperature is too hot, with it being only 200 °C. As you can see, the printer only has a one sided cooling solution with a very small fan conduct.
- Printer: Anycubic I3 Mega S
- Slicer: Cura
- Material: PLA
- Extruder Temp: 200 °C
- Bed Temp: 60 °C
- Print speed: 45 mm/s
- Travel speed: 100mm/s
- Layer height: 0.2 mm
- Layer width: 0.4 mm
- Nozzle: 0.4 mm
- Infill: 10 %
- Retraction distance: 4.5 mm
Retraction speed: 40 mm/s
So I am suspecting it must have something to do with the way, it is sliced. Does anyone have an idea?
Update: I started the print again with aligned seams. Now you can clearly see the artifact. At the point of the seam the print is warped inwards and upwards.
I did some more prints and tried to increase retraction distance up to 10 mm and retraction speed up to 60 mm/s, but I also did not manage to improve the print. I also tried to enable the "retract at layer change" option and to disable "Z Hop When Retracted" but without success.
I set the travel speed down to 45 mm/s with no change in print quality.