Gaps in walls or top layers
4 usi3d guides for “Gaps in walls or top layers”, each with the likely causes, how to check which one is yours and the step-by-step fix, with each manufacturer's official sources.
They all apply to any FDM printer, from any brand.
Each guide summarises the official documentation and says whether usi3d has already verified it on a machine.
Any FDM printer (4 guides)
- Bridges and overhangs that sag or deform
On bridges (sections printed in mid-air between two supports) the plastic droops, leaving strings or sagging lines underneath.
- Gaps in the top surface, in the walls or between infill and perimeters
The top surface has holes, separated lines or bulges (the infill shows through), gaps appear between perimeters or between the walls and the infill, or holes appear on…
- High-speed PLA: which temperature and flow to use so it does not come out with gaps or weak layers
With a high-speed PLA (those sold for printing at several hundred mm/s), the part comes out with gaps, walls thinner than intended or layers that split easily, the shine…
- Not enough plastic: gaps and thin walls (under-extrusion)
Material is missing from the part: thin or separated lines, gaps between perimeters, incomplete layers or porous top surfaces.
More “Print quality” problems
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