First Layer Not Sticking
Prusa 3D Printer
Severity: ModerateWhat Does This Error Mean?
If the first layer is not sticking or is too squished, the Live Z (Z-offset) needs adjustment. Prusa printers use a probe for auto bed leveling, but the Z-offset fine-tunes the nozzle-to-bed distance. Run First Layer Calibration from the menu.
Affected Models
- Prusa MK4
- Prusa MK3S+
- Prusa Mini+
- Prusa XL
Common Causes
- Live Z offset not calibrated — nozzle too high or too low
- Build plate dirty — oils from fingers
- Wrong build plate type selected in PrusaSlicer
- PINDA/SuperPINDA probe giving inconsistent readings
- Build plate warped
How to Fix It
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Run First Layer Calibration from the LCD menu.
LCD > Calibration > First Layer Calibration. Adjust Live Z during the test print until the first layer is slightly squished but not transparent.
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Clean the build plate with isopropyl alcohol (90%+).
Wipe before every print. Finger oils are the #1 cause of poor adhesion. For stubborn residue, wash with dish soap and warm water.
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Make sure the correct sheet profile is selected.
Different sheets (smooth PEI, textured, satin) need different Z-offsets. The printer stores a separate Z-offset for each sheet profile.
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For persistent issues: recalibrate the PINDA probe.
The PINDA probe height can shift over time. Follow Prusa's guide to reset the probe calibration.
Frequently Asked Questions
What does a good first layer look like?
Slightly squished with no gaps between lines. Not transparent (too close) and not round/stringy (too far). Prusa has a visual guide in their knowledge base.
What is Live Z?
Live Z is Prusa's term for the Z-offset — the fine adjustment of nozzle height relative to the bed. You can adjust it during printing by turning the knob.