See the image above that shows some extra external single extrusion "Triangles" have been added to the top internal layer. They do not exist in the model that I designed in Fusion360. Went to Preview it and there they are. And it prints them. So why are they there??
I tried to find something in the forum but could not find an exact hit.
Here's what caused it. I can make them appear and disappear. This to me is a bug.
I have attached the .STL file in the picture and also the FFF Settings File.
I have an uneven bed so I added a Global G-Code Offset Z-Axis = 0.1 to lift everything a little higher.
I am using a layer height of .2mm.
So to compensate for the added height .2mm + .1mm = .3mm first layer height, I changed the First Layer Height to 150%. .3/.2 = 1.5.
I also have First layer Width at 110% but changing this value does not correct the issue above.
So when I do this and have a exact ratio the little triangles in the picture appear.
If I change the First Layer Height to 149% or 151% the problem goes away and the little triangles go away and do not print.
Changing the Global Z-Offset back to zero does not change anything so it appears it's a ratio problem with layer height and First Layer Height.
So another test.....
Changing layer height to .15 the First Layer Height at 150% and the problem does not appear.
Staying with Ratio's I enter .15 Layer Height and 200% First Layer Height and still no problem.
Can't figure out what' Ratio is causing the phantom lines to appear.
Anyone got an idea?