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solid plastic, while the rest is air. While the interior of the part may be partially
hollow, we want the exterior to remain solid. To do this, Anet3D allows you to
specify how many solid layers you want on the top and bottom of your part. For
example, if you were printing a simple cube with 5 top and bottom solid layers,
the software would print 5 completely solid layers at the top and bottom of the
print, but everything else in the middle would be printed as a partially hollow layer.
This technique can save a tremendous amount of plastic and time, while still
creating very strong parts. However, depending on what settings you are using,
you may notice that the top solid layers of your print are not completely solid. You
may see gaps or holes between the extrusions that make up these solid layers.
If you have encountered this issue, here are several simple settings that you can
adjust to fix it.
5.1 Not enough top solid layers
The first setting to adjust is the number of top solid layers. When you try to
print a 100% solid layer on top of your partially hollow infill, the solid layer has to
span across the hollow air pockets of your infill. When this happens, the
extrusions for the solid layer have a tendency to droop or sag down into the air
pocket. Because of this, you generally want to print several solid layers at the top
of your print to ensure a nice flat, completely solid surface. As a good rule of
thumb, you want the solid section at the top of your print to be at least 0.6mm
thick. So if you are using a 0.2mm layer height, you would need at least 3 top
solid layers. If you are printing at a lower layer height such as 0.1mm, you may
need 6 solid layers at the top of your print to achieve the same effect. If you are
noticing gaps between the extrusions in your top surface, the first thing you
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