Gaps in perimeter  

RE: Gaps in perimeter

Hi Pipcorona, 
Are you sure the gaps are at the  start and finish of the layers?   

try a cylindrical test piece with the seam position set to 'Aligned'  (in the 'Print Settings >Layers and Perimeters' menu, at the bottom

and this will cause a seam like this

if the gaps are now aligned then you have proven that the issue is at the start finish seam area

I couldn't find a way to eradicate the gaps, without going to Spiral Vase Mode...   but on maximum magnification this seemed to show a massive number of tiny cracks , which don't seem to materialise when printing.

regards Joan

RE: Gaps in perimeter

@joantabb

I am able to confirm that by watching the print. It leaves a visible gap in the print too which weakens the print.

RE: Gaps in perimeter

See if changing any of these helps.

ps: sorry about image sizes, but this damn forum sucks now that they've change image sizing properties.

RE: Gaps in perimeter

Oh, and are you using an MMU?  What is the K factor you are using?

RE: Gaps in perimeter

@tim-m30

I tried getting rid of the gap closing radius and it is still there. I am not using an MMU. Forgive my ignorance, but what is the K factor?

RE: Gaps in perimeter

Part of the custom gcode; k-factor changes the start-stop flow characteristics.  If wrong, it can cause gaps and oddities at seams.

Are you concerned about the gap shown in P.Slicer? Or are your parts having gaps?  A photo of an affected part will be more helpful.

RE: Gaps in perimeter

@tim-m30

For my PLA it is

M900 K{if printer_notes=~/.*PRINTER_HAS_BOWDEN.*/}200{elsif nozzle_diameter[0]==0.6}18{else}30{endif} ; Filament gcode

And PETG is

M900 K{if printer_notes=~/.*PRINTER_HAS_BOWDEN.*/}200{elsif nozzle_diameter[0]==0.6}24{else}45{endif} ; Filament gcode

RE: Gaps in perimeter

Still need an image of the part that has the problem.  Once we see the actual problem, maybe we can help.

RE: Gaps in perimeter

I am experiencing this problem as well.

RE: Gaps in perimeter

I tried changing the closing radius to 0mm and it made no difference.  I tried 0.2mm and the problem was worse.

RE: Gaps in perimeter

The STL file was generated from FreeCAD.

RE: Gaps in perimeter

I'm having the issue with perimeter gaps as well. It makes them in the same layer and it's visible a lot on the actual print.

RE: Gaps in perimeter

@steven-s23

The parameter Slice gap closing radius is used to correct small gaps/errors in STL files before slicing. It has no effect on the printed perimeter gaps.

The small defects in perimeter is created when the extruder starts/stops extrusion. Depending on the used filament, K value, temperature and retraction the defects can be minimized. I normally set the seam position to aligned or rear to move the defects to a non important position on the model.