rough - smooth surface

[danfin 0]

my 3d printer produces quite rough surfaces on the lower 2 centimeters of this object, and above produces nice even looking layers. The heat bed is at 50°, a lower bed temp does not affect the quality. Printing 0.06mm Layers at 200° and 7mm/sec. The walls are about 1mm, nozzle is 0.4mm. Any hints on why this changes from rogh to smooth?

[Carla_Birch 116]

Personally i would up the hot end by 5c at a time up to about 215c. I normal print PLA at 205c and it could be that its taking your printer a bit to full get a good flow going as that part don't look very big.

[gr5 2,167]

I would print faster - maybe 25mm/sec at least but I suspect this has nothing to do with your issue.

 

The telling piece of information is the 1mm thickness.  Look at this part in preview mode and look at the blue movement lines (make sure travel color is enabled) and look at the difference between bottom 1/3 and top 1/3 of your part.

 

I don't know exactly how to improve your part - maybe make it a bit thicker (the upper part is probably thicker when viewed as horizontal slices wheras the thickness as travelled by a normal (perpendicular to surface) is probably always 1mm as you say.

 

Therefore it appears the thicker areas are doing better.

 

You might also try the MB/burtoogle version of Cura which does better with "thin" walls.  Less craziness, less moves:

https://www.dropbox.com/sh/s43vqzmi4d2bqe2/AAADdYdSu9iwcKa0Knqgurm4a?dl=0&lst=

[danfin 0]

oops, speed is higher of course.. it was 70mm/sec now is 60mm/sec. I raised temperature to 215°, and I tried 'spiralize outer contour' which seems to help, as the nozzle now travels continuously, with a simpler cone object. So next I'll try if enable jerk control might work too, and allow to print more complex objects. I am trying the MB/burtoogle version but I don't see much difference, I blieve it's a settings problem rather. Left one is with improved settings.

Edited June 13, 2020 by danfin