What this guide helps fix
Use this guide when a Prusa printer has first-layer problems, sheet-profile mismatch, rough extrusion, belt concerns, or inconsistent surface finish after changing filament or sheet type.
Quick diagnosis checklist
- Confirm the active sheet profile matches the installed plate.
- Check Live-Z with a real first-layer pattern, not only the wizard.
- Clean PEI sheet correctly for the material.
- Inspect nozzle wear and filament path resistance.
- Check belt status and listen for skipped motion.
Step-by-step fix order
- Select the correct sheet profile and material preset.
- Clean the build sheet and run a Live-Z test.
- Print a small calibration part at default speed.
- Tune extrusion multiplier only after first layer and filament dryness are confirmed.
- Check belts and bearings if ringing or layer shifts appear.
- Create separate profiles for smooth PEI, textured PEI, and satin sheets.
Settings and mechanical checks
| Check | What to look for | What to change first |
|---|---|---|
| Live-Z | First layer too high or too crushed across the whole bed. | Adjust Live-Z with a wide test patch. |
| Sheet profile | Prints fail after swapping plates. | Use separate sheet profiles. |
| Extrusion multiplier | Walls too thin/thick or top gaps. | Tune after temperature and dryness. |
STLBEAST rule: Change one thing at a time, run a small test print, and save the working profile before moving on.
When to use AI Doctor
Use AI Doctor when the symptom could be mechanical, slicer-based, and material-based at the same time. Include printer model, material, nozzle size, layer height, speed, bed type, and a clear photo of the failed print.