HomeTroubleshootingVFA
Diagnostic Flow

Troubleshooting:
VFA

Vertical fine artifacts repeating on walls

Time
8–15 min
🎯
Mode
Guided
Impact
Advanced
📐
Answer questions. Get the cause.
This flow keeps the tested CN3D diagnostic logic and only changes the presentation.
1

Diagnostic Progress

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Start by describing what you see. Your answers will build a diagnostic path.
Step 1 of 4

At what interval do VFA lines appear?

Interval is the key diagnostic: 2mm = GT2 belt tooth pitch. ~7mm = 20-tooth GT2 pulley circumference. Irregular = bearing or other factor.

Related issues

🛠️Recommended calibration

Check these before changing random slicer values.

Max Volumetric FlowCalibrationFind the real melt limit of your hotend.📐Pressure AdvanceCalibrationClean up corners, starts and line pressure changes.
Open Calibration

📚Read the explanation

Understand why this symptom appears.

📐Pressure Advance ExplainedArticleWhy corners bulge and how PA compensates.
Open Knowledge Base

🎓Structured learning

Go deeper when the same problem keeps coming back.

🎓CN3D LearnLearnBuild the troubleshooting mindset instead of copying fixes.
Open Learn