Cura create strange holes in a very thin volume

[mercatp 0]

Hi !
 

I would like to print a surface with a thickness of 0.4mm.
I created an object with the property that every slice give a path with at least 0.4mm thickness, but Cura makes strange holes in it (see joined picture).

Does somebody has an explanation ?

DynikovSurface1.stl

[gr5 2,230]

Try checking the box "print thin walls".

[obewan 37]

Also set surface mode to 'surface'

 

[GregValiant 1,351]

Surface makes it thicker (0.8?).  I haven't been happy with any setting combinations.

 

Scaling it to 102% worked.  Remember to set the bottom back on the build plate.

Edited February 17, 2021 by GregValiant

[gr5 2,230]

Rather than scaling it you have 3 other options I can think of immediately: horizontal expansion, print thin walls, change line width down a bit to say 0.35mm.

[nallath 1,124]

You could also try the new version of the slicing algorithm:

 

[GregValiant 1,351]

Something to play with in the morning...

Printed with 4.8 and horizontal expansion at .02 on the left.  Arachne with line width at .35 on the right.  .4 nozzle at .2 layer height.  Ender 3 Pro.

 

 

Measuring thickness - the Arachne print is .65 and the 4.8 print is .91.  It's hard to measure due to the bulbs on the ends of the lines.  The Arachne print has a line missing about 2/3 up and isn't as neat.  That could be the printer's fault as there isn't much material flow in that part.  The 4.8 print with more material in it and does look better.  Minimum layer speed 5mm/sec.  Using "Lift Head" made a mess.

 

PS: @gr5, @ahoeben, Horizontal Expansion of .02 makes the wall .44 thick.  Scaling 102% makes it .408 thick.  Line width changes and Print Thin Walls didn't have any effect.  It's a fussy little bugger.

[gr5 2,230]

I think @mercatp is not reading the answers here.  He just asked the same question over in the french area even though we gave him several good answers here.