[2.3.55.5] Broken thin walls on 0.2 Initial Layer Height

[jesterhead82]

Version

2.3.55.5

Operating system type + version

Win10

3D printer brand / version + firmware version (if known)

CR10V2 / Marlin 2.X

Behavior

• Unconnected thin walls
• Inconsistent width on thin walls

Only on Initial Layer Height 0.2, works e.g. on 0.32 or 0.16

• Initial Layer Height 0.2 (broken)
  

-Initial Layer height 0.32 (works)

• Initial Layer height: 0.16 (works)
  

Project File (.3MF) where problem occurs

Rear Door Outer Frame_0.20InitialLayer.3mf.zip

[supermerill]

just running your project file:

I don't know how to reproduce your problem...

[jesterhead82]

Hi,

it's visible on the two larger parts, right side of the bed, even in your screenshot:

[supermerill]

Found it, very hard bug to understand as it's deep inside the boost lib.
As I can't really fix it, I've added a mitigation process: if the lines from boost voronoi are off, then offset the lines a bit and try again.

[sttts]

First I thought this is the problem I see, but it isn't, though connected to thin walls too:

As you see with the lower object: perimeter 4 for vertical walls. But the thin wall is hollow, only infill (13%).

The same object with the same profile with 2.2 I get solid walls, as expected:

[sttts]

Maybe #991.