When my Ender 3 prints a top or bottom layer, it leaves a line on the layer. enter image description here

enter image description here

  • Slicer Cura
  • Linear Advance: 0.57
  • Retraction: 3 mm @ 35 mm/s
  • Max Speed: 100 mm/s
  • Ironing enabled
  • Minimum wall flow: 20 %
  • Temperatures: 205 °C hotend and 65 °C bed

My belts are tight enough as I push them they spring back up. I bought a support block for my Z lead screw to help with z banding (I also removed it to see if it will fix the issue but it didn't). I tried 50 mm/s, No Infill, swapped out to brand new 0.6 mm nozzle (the picture has 0.4 mm), Minimum wall-flow to 0 % but no improvement. It has to lead me to think its a mechanical issue but I am not sure where to start.

  • $\begingroup$ Try calibrating again it E steps and, if it doesn't help, try reducing the extrusion multiplier by 1-2% $\endgroup$ – FarO Apr 24 at 20:08
  • $\begingroup$ @FarO I have calibrated e steps and flow rate from E3Ds guide. I tried 95% and 98% extrusion but it made it more more prominent. My current extrusion multiplier is 99.3% $\endgroup$ – Aalian khan Apr 25 at 6:34
  • $\begingroup$ However you see that the excessive extrusion happens only near the edges, where there is deceleration. Are you sure the linear advance calibration is correct? $\endgroup$ – FarO Apr 25 at 7:27
  • $\begingroup$ In the calibration test, there is a bump but its the best compared to the others. I will do another test without LA and check the difference. $\endgroup$ – Aalian khan Apr 26 at 19:40
  • $\begingroup$ There is no difference.just the corners are more bumpy $\endgroup$ – Aalian khan Apr 30 at 21:17

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