Quick diagnosis
Fix Neptune 4 Pro first-layer problems with Z-offset, mesh leveling, bed cleaning, gantry checks, and slicer first-layer settings.
Likely causes
- Z-offset too high
- Mesh not saved or not loaded
- Dirty PEI sheet
- Gantry tilt
Step-by-step fix
- Warm the bed before probing.
- Check gantry level.
- Clean the PEI sheet.
- Run a slow first-layer test square.
What to check before changing more settings
Only change one variable at a time. Save your current slicer profile before testing, use a small repeatable test print, and compare the result before moving to the next adjustment.
Helpful gear to check
These are contextual tool links, not required purchases. Use them only if they match your printer and the problem you are solving.
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Elegoo Neptune PEI Sheet
Check compatibilityUseful for this fix path. Confirm size, printer compatibility, seller, price, and return details before buying.
View on AmazonAmazon searchNeptune 4 Pro Nozzles
Check compatibilityUseful for this fix path. Confirm size, printer compatibility, seller, price, and return details before buying.
View on AmazonAmazon searchSilicone Bed Spacers
Check compatibilityUseful for this fix path. Confirm size, printer compatibility, seller, price, and return details before buying.
View on AmazonAmazon searchFilament Dryer
Check compatibilityUseful for this fix path. Confirm size, printer compatibility, seller, price, and return details before buying.
View on AmazonContinue from this guide
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