Medium 15-30 min PLAPETGABSASA

Top Surface Holes

The top surface has small holes, bumps, or gaps where the infill pattern shows through.

Top Surface Holes example 1
Top Surface Holes example 2
Top Surface Holes example 3

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Likely causes

Too few top layers
Increase top layers until total top thickness is at least about 1.0 mm for common nozzle sizes.
Infill is too sparse
Raise infill to 15-20 percent or use denser infill near top surfaces.
Top layer speed or cooling is poor
Slow top surfaces and use enough cooling so the top lines bridge cleanly over infill.

Recommended settings by material

MaterialNozzleBedFan
PLA 195-210 C50-60 C80-100%
PETG 230-245 C70-80 C30-60%
TPU 220-235 C40-50 C30-50%
ABS 240-260 C95-110 C0-30%
ASA 240-260 C95-110 C0-30%

Prevention tips

Change one setting at a time and reprint a small test piece.

Keep filament dry and store open spools in sealed bags or dry boxes.

Clean the build plate regularly and verify the correct slicer profile before long prints.

Related problems

StringingWarpingFirst Layer Not Sticking

Last reviewed Jun 15, 2026. Troubleshooting content is for reference only.