Troubleshooting article about gaps in the surface

[Ghostkeeper]

I'd like to add a new article about having gaps in the surface, prints not being watertight.

There's two kinds that could be addressed. Gaps are caused by underextrusion, in which case they are everywhere. And there's gaps arising from where line types are supposed to meet, but don't, like between the skin and infill.

Underextrusion gaps should refer to the underextrusion article, and give a few extra suggestions for things that are common to cause actual gaps. I'm thinking having too wide a line width or printing too fast.

Gaps between different line types are more interesting. We should address both the case between skin and walls and the case between infill and walls. The case between infill and skin can be omitted then. People will get the idea. We should explain the physical aspect of why this occurs at these boundaries: As the nozzle creates lines and turns back, the line it just created isn't solidified yet and will be pulled along back, causing it to regress a little bit from its intended endpoint. Main ways to resolve these issues are, from the top of my head:

• Infill/skin overlap settings.
• Printing slower.
• Increasing temperature.
• Not using a lines pattern / using connected infill lines or zigzag pattern.

There's also a really common question from people asking why there's gaps in their walls in layer view because they accidentally enabled coasting, or it was enabled for them in a profile. I don't think it's in scope to address this since it's a problem with layer view rather than the actual print. But it's something to consider.