The top layers should form a smooth, sealed surface. Gaps in the top surface mean infill isn’t being covered properly, usually due to low top layer count, under-extrusion, or poor overlap with infill.
Symptoms:
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Visible gaps or holes in top surface.
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Infill pattern visible through surface.
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Weak top surface strength.
Causes:
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Too few top solid layers.
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Low infill percentage.
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Under-extrusion.
Troubleshooting Steps:
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Increase number of top solid layers (min 5–6 for standard nozzle).
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Raise infill percentage slightly.
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Verify extrusion calibration.
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Adjust top surface flow rate.
Prevention Tips:
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Use adequate infill density for load-bearing prints.
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Test surface finish with calibration cubes.
