I am a new to 3D printing, somehow, the infill of my print compiled by Cura 4.5 is weak. I print with generic PLA (FD plast) on 200 °C. See image below:

PLA printed part with failed infill

Print details: I have a Zonestar Z6FB which I use together with Cura 4.5. I print in PLA at 200 °C (Cura default for PLA). The print bed is set to 60 °C. I use a print cooling fan at 100 %. The layer height I set to 0.1 mm, the line width (wall thikness 0.8 mm?) from the 0.4 mm nozzle. The Printing Speed is set to 60 mm/s for everything. My retraction is unknown.

  • $\begingroup$ It looks like the printer is under extruding, the 2 walls barely touch, this can also lead to the infill pattern you see. You could try to calibrate the extruder. You can also try printing a little slower. $\endgroup$ – 0scar May 4 '20 at 21:25

You problem clearly under extrude which mean the plastic not flow as much as it should be. I face this problem recently here my step to solve.

  1. Tune e step (do this first)
  2. Add more temp. to nozzle (so plastic will melt and flow faster)
  3. Slow down print speed.
  4. Change nozzle and clean whole hotend.
  • $\begingroup$ Hi! Thank you for answer. I have several q to you. "e" step did you mean extruder Flow percent? I am already print at 200 celsius, I recently print at 180 and it sems to be better with PLA. Cleaning Hot end from dust? $\endgroup$ – Marat Zakirov May 5 '20 at 5:08
  • $\begingroup$ It’s extruder step per milliliter calibration. $\endgroup$ – M lab May 5 '20 at 8:46
  • $\begingroup$ Some plastic just burn out and become a solid material that block the nozzle. $\endgroup$ – M lab May 5 '20 at 8:48
  • $\begingroup$ I cleatly see that walls are definitly ok, how it is possible to make sily infill and pretty well walls? $\endgroup$ – Marat Zakirov May 5 '20 at 9:54
  • $\begingroup$ I don’t know why last time I face this problem I’ve try everything, still not working then I change nozzle it suddenly work me be nozzle just got partial clogging with allow low rate flow. $\endgroup$ – M lab May 5 '20 at 9:58

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