Strange outer wall print issue

[aweislet 0]

I'm stumped.  Printing with .8mm nozzle, Cura Slicer 4.4.1 using 3d model created in Fusion360.

So I printed a large section of a boat hull using PLA that has a wall thickness of 2.4mm so it's three walls thick using the .8mm nozzle at .32 mm layer height and wall speed 30mms.

Nozzle temp 210. Fan on. Retraction 6.5.

 

The print came out great except for one side that appears to goop up or not extrude all the way. 

As mentioned earlier the opposite side is fine.  Not sure if it's the slicer, stl file or my printer.  When I preview the slice it looks fine.

Any ideas would be greatly appreciated.  Thanks Alex.

 

 

 

Edited March 11, 2020 by aweislet

[geert_2 558]

Your image didn't come through. Normally, in Windows you can just drag and drop an image from the Explorer into this editing box. Or copy and paste from image viewers like IrfanView, or from Windows Clipping Tool. Could you try that again?

 

[bagel-orb 61]

Actually, your model is 1.5 walls thick, since walls are printed on all sides. The one outer wall is present on both outsides. 1.5 is not a whole number and there lies the problem. It will try to print 2 walls in some locations and reduce the difference using overlap compensation, or it will try to print one and fill in the gap using Fill Gaps Between Walls.

 

You'll have less rounding problems if you make your model 2.3mm wide or change your line width settings to 0.81mm.

 

We're working on preventing those rounding errors, but it is a lot more difficult than you might suspect. Hopefully we'll have a release in a couple of months or so which prevents the rounding error.