Medium 15-35 min PLAPETGTPUABSASA

Visible Z Seam

A vertical line of small blobs or marks appears where each layer starts and stops.

Visible Z Seam example 1
Visible Z Seam example 2
Visible Z Seam example 3

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Likely causes

Seam placement is exposed
Move seam position to a back corner, sharp edge, or aligned location where it is less visible.
Pressure advance needs tuning
Tune pressure advance or linear advance to reduce start-stop blobs.
Retraction and wipe need tuning
Use small retraction, wipe, or coasting adjustments to reduce material left at layer changes.

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.