Failure guide
Poor First Layer Fix
The first layer tells you almost everything: gaps mean too high, ridges mean too low, uneven corners point to mesh or tilt. Run one patch before touching the rest of the profile.
Independent third-party notes. Verify firmware, heater, electrical, and vendor-specific work against official documentation for your exact printer.
Match your symptom first
Pick the closest pattern, then run one proof test.
Round separate lines with gaps between passes Round separate lines with gaps between passes Wash the plate, then print the five-patch first-layer STL in the same bed area. Use this branch Transparent lines, ridges, scraping, or nozzle plowing Transparent lines, ridges, scraping, or nozzle plowing Print only the center patch and watch the nozzle during the first two lines. Use this branch Same bad first layer after touching the plate Same bad first layer after touching the plate Clean using the plate maker method and repeat one patch without changing slicer settings. Use this branch Center patch is good but one corner is loose or scraped Center patch is good but one corner is loose or scraped Print all five patches and mark which corner fails. Use this branch One spot never sticks or shows scratches/coating gaps One spot never sticks or shows scratches/coating gaps Move the patch to a clean area or flip/swap the plate if possible. Use this branch
Start here
The nozzle-to-bed distance or surface condition is wrong for the first layer.
The first layer tells you almost everything: gaps mean too high, ridges mean too low, uneven corners point to mesh or tilt. Run one patch before touching the rest of the profile.
- Check first
- Wash the plate, then print a small first-layer patch in the center and corners.
- Change only this
- Z offset or first-layer height, not flow and temperature together.
- Verify with
- A one-layer patch with connected lines, clean edges, and no nozzle scraping.
- Time
- 4 min setup
- Risk
- Low
- Needs purchase
- No, unless the plate coating is damaged.
Pick what you see
Poor First Layer mini diagnosis
Pick the first-layer pattern you can actually see, then change one Z/plate variable only.
If you see
Round separate lines with gaps between passes
- Likely cause
- Nozzle is too high or the plate is not gripping.
- First test
- Wash the plate, then print the five-patch first-layer STL in the same bed area.
- Change only this
- Lower Z offset in 0.02 mm steps.
- Parameter range
- Live Z / Z offset: 0.02 mm steps; rarely more than 0.10 mm from known-good setup
- Stop when
- Lines are connected but not translucent or ridged.
- Verify with
- Adjacent lines touch without loose strands when the patch cools.
Print five-patch test first Use this before changing flow, temperature, or the whole slicer profile.
Open next branch Submit tested case Pick the exact path
Most failed fixes go wrong when they start from the wrong branch.
Bambu A1 poor first layer on textured PEI
A1 or A1 mini, textured PEI, auto calibration completed, but the first layer still shows gaps, rough ridges, or one loose corner.
- First test
- Wash the textured sheet, run calibration, then print the five-patch first-layer STL without changing flow.
- Change only this
- Plate cleaning first; then live Z in 0.02 mm steps only if the patch still proves a height issue.
- Stop when
- All five patches show connected lines without nozzle scraping or loose corners.
Poor first layer after changing nozzle
The printer worked before a nozzle, hotend, or toolhead change, then the whole first layer shifted high or low.
- First test
- Check nozzle seating and heat-tightening, then run the five-patch test with the old slicer profile.
- Change only this
- Nozzle seating or Z offset. Do not retune flow before proving the mechanical change.
- Stop when
- The patch returns to the old squish pattern with the same material and temperatures.
PETG sticking too hard to PEI
PETG bonds aggressively, leaves marks, or risks tearing the PEI coating while the first layer still looks over-squished.
- First test
- Print one small PETG patch after cooling fully; compare release force before changing bed temperature.
- Change only this
- Release surface or Z squish. Do not raise bed temperature to solve a release problem.
- Stop when
- The part stays down during printing and releases cleanly after cooling.
Visual diagnosis
Match the visible pattern before changing settings.
Original synthetic diagnostic reference plus licensed look-alike references; confirm with the test or log evidence below.
Looks like this
- Lines are separate, rope-like, scraped, or lifting in the first minute.
- The problem starts before infill or upper walls matter.
- One bed area may look different from another.
Not this
- Random strings between towers are a stringing problem, not first-layer Z.
- Layer shift after several millimeters is motion hardware, not the first layer.
- A print that detaches after hours may be warping after the first layer, not just Z offset.
Common look-alikes
- Warping after a good first layer
- PETG over-adhesion on smooth PEI
- Partial clog causing missing first-layer lines
- Elephant foot from too much squish or heat
Inspect in the photo
- Line contact: separate, just touching, or plowed into ridges.
- Whether only corners fail or the whole bed fails.
- Plate surface: fingerprints, glue residue, coating damage, or debris.
- Nozzle drag marks or translucent over-squished lines.
Photo cannot prove
- Exact Z offset number
- Probe repeatability
- Whether the plate coating is permanently damaged
- Whether the filament is contaminated or wet
Trust visual library
Use the image type, not just the picture.
Real references, look-alikes, material context, and synthetic diagnostic examples are separated so they do not overclaim what a photo can prove.
Real reference
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Synthetic diagnostic reference
Before / after
Compare one small test, not a whole print.
Use the same small test before and after the change so the comparison means something.
Download a quick test
Five-patch first-layer test
Check center and corners after plate cleaning, nozzle work, or Z offset changes.
- File
- STL
- Typical time
- 3-7 min
- Material
- PLA for baseline; PETG only if diagnosing a PETG-specific plate issue.
- Dimensions
- 120 x 90 x 0.3 mm overall; five thin patch zones.
- Footprint
- 120 x 90 mm
- Height
- 0.3 mm
Quick print settings
Download STL - Layer height
- Use the profile first-layer height, usually 0.20-0.28 mm.
- Infill
- 0%; single-layer patches only.
- Walls
- Default wall count is fine; do not tune flow here.
- Supports
- Off.
- Speed
- 20-30 mm/s first-layer troubleshooting range.
What it testsCenter vs corner Z contact, plate cleanliness, bed mesh/tilt, and first-layer adhesion.
When to use itAfter plate handling, nozzle changes, new sheets, failed first lines, or uneven bed areas.
Keep unchanged
- Material spool
- Nozzle temperature
- Bed temperature
- First-layer speed
- Slicer profile except the one tested setting
Expected good resultFive patches have connected lines, clean edges, and no scraping.
Failure result meaningAll patches bad points to Z/plate cleaning; one corner bad points to mesh, tilt, or plate seating.
Slicer notes
- Use your normal first-layer height.
- Keep bed temperature and plate surface unchanged.
- Disable brim, raft, ironing, and adaptive flow tricks.
Good result meansZ contact and plate condition are good enough to test a normal part.
If it does not changeAll patches bad points to Z/cleaning; one area bad points to mesh, tilt, or plate seating.
If it gets worseUndo the last Z step and inspect for nozzle drag or plate contamination before changing flow.
Recommended Checks
0/4 done Start with the first check. Keep this page open while you test. The checklist saves on this browser so you can come back after the print finishes.
Verification
- Lines are connected with a smooth top texture and no transparent gaps.
- The nozzle does not click, drag, or leave rough ridges across the patch.
- A normal part starts without manual babysitting or corner lift.
Only if the test points here
Tools and supplies for the proven branch
Plate cleaning and release kit
Before you compare
Wash the plate, print the same first-layer patch in two bed areas, then compare release and line shape.
- Buy signal
- The failure follows a scratched, polished, contaminated, or PETG-sensitive surface after Z offset is already sane.
- Skip if
- The same patch fails in every area before cleaning or Z offset is verified.
- Save evidence
- Bottom photo, plate-area photo, material, bed temperature, and whether the patch moved with the plate area.
Clean first, then replace or add release only if the failure follows the plate surface.
Filter for
- PEI-safe cleaner or dish soap workflow
- Release layer only for PETG-risk surfaces
- Replacement sheet that matches your printer size and magnet system
Avoid buying
Compare after test - A new plate for a dirty plate
- Release agent for PLA that already will not stick
Nozzle and cleaning kit
Before you compare
Run a hot extrusion or cold-pull check, then print a small flow wall with the same filament and temperature.
- Buy signal
- Extrusion curls, skips, or stays inconsistent after cleaning, or a brass nozzle has seen abrasive filament.
- Skip if
- The problem is only first-layer Z, bed mesh, or wet filament.
- Save evidence
- Free-air extrusion photo, cold-pull result, nozzle size/material, filament type, and whether flow changed after cleaning.
Replace the nozzle only after the extrusion path test makes the blockage or wear visible.
Filter for
- Correct nozzle thread and length
- Brass for normal PLA/PETG
- Hardened steel or similar only for abrasive filaments
- Cleaning needles sized for the nozzle
Avoid buying
Compare after test - Hardened nozzles as a first-layer fix
- Random nozzle packs that do not match the hotend
Print Fixes may earn from qualifying purchases when commerce links are configured. Diagnostic steps stay independent: buy only when the failure evidence points to the part.
Field guide
Follow the branch that matches your print
Round separate lines with gaps between passes
- Likely cause
- Nozzle is too high or the plate is not gripping.
- First test
- Wash the plate, then print the five-patch first-layer STL in the same bed area.
- Change only this
- Lower Z offset in 0.02 mm steps.
- Verify with
- Adjacent lines touch without loose strands when the patch cools.
- Stop when
- Lines are connected but not translucent or ridged.
Transparent lines, ridges, scraping, or nozzle plowing
- Likely cause
- Nozzle is too low or first-layer flow is too heavy.
- First test
- Print only the center patch and watch the nozzle during the first two lines.
- Change only this
- Raise Z offset in 0.02 mm steps before changing flow.
- Verify with
- The nozzle no longer scrapes and line tops are slightly flattened.
- Stop when
- Ridges disappear without creating gaps between lines.
Same bad first layer after touching the plate
- Likely cause
- Oil, dust, glue residue, or incompatible cleaning method is blocking adhesion.
- First test
- Clean using the plate maker method and repeat one patch without changing slicer settings.
- Change only this
- Plate cleaning only.
- Verify with
- The same patch sticks with the old Z value.
- Stop when
- Adhesion returns after cleaning; do not keep moving Z.
Center patch is good but one corner is loose or scraped
- Likely cause
- Mesh, gantry tilt, probe repeatability, plate seating, or bed level differs by area.
- First test
- Print all five patches and mark which corner fails.
- Change only this
- Reseat plate and rerun mesh/leveling, not global Z.
- Verify with
- All patches show the same squish pattern.
- Stop when
- Corner behavior matches the center within one small Z adjustment.
One spot never sticks or shows scratches/coating gaps
- Likely cause
- Plate coating is damaged or contaminated beyond normal cleaning.
- First test
- Move the patch to a clean area or flip/swap the plate if possible.
- Change only this
- Print location or plate side.
- Verify with
- The same model works on an undamaged area with unchanged slicer settings.
- Stop when
- Failure follows the damaged plate area rather than the model.
Concrete Parameter Range
| Setting | Start | Range | Change when | Stop when | Too far looks like |
|---|---|---|---|---|---|
| Live Z / Z offset | Current known-good value | 0.02 mm steps; rarely more than 0.10 mm from known-good setup | Lines are round/separate or plowed/ridged | Lines just touch with no scraping | Too low creates ridges, translucent lines, or nozzle drag; too high creates gaps and loose strands. |
| First-layer speed | 20-30 mm/s troubleshooting range | 15-35 mm/s | Small features pull loose after Z is correct | Patch sticks without distorted corners | Too slow can overheat tiny details; too fast pulls corners loose. |
| Bed temperature | Material profile | PLA 55-65 C, PETG 70-85 C, ASA/ABS 90-110 C | Correct Z and clean plate still release early | Patch stays down and releases after cooling | Too hot can cause elephant foot, glossy over-squish, or PETG over-adhesion. |
| First-layer nozzle temperature | Profile value | +0 to +10 C above normal print temp | Correct Z still does not wet the surface | Lines wet the plate without elephant foot | Too hot makes edges soft, glossy, or swollen. |
| Initial layer flow | 100% or profile default | 95-105% only after Z is proven | Correct Z shows uniform but slightly narrow/wide lines | Patch measures and looks consistent | Too high mimics low Z; too low mimics high Z. |
Material / Machine Differences
Bambu A1 textured PEIRun calibration, clean the textured sheet, and use the five-patch test before touching flow.
Prusa smooth/textured PEIDifferent sheets often need different live-Z values; do not reuse one sheet offset blindly.
Ender-style manual bedLevel/tram first, then adjust Z; one bad corner often means bed tilt rather than slicer flow.
Klipper bed meshIf center is good and corners differ, inspect mesh loading, probe repeatability, and gantry tilt.
PETG on PEIAvoid over-squish and follow plate release guidance; PETG can bond too strongly.
Wrong Turns
Tuning flow while Z is wrongThe second layer may look better while the root first-layer distance remains wrong.
Adding glue before cleaning the plateResidue can hide the real adhesion signal and make the next test harder to read.
Changing bed temperature, Z, and speed togetherYou cannot tell which variable fixed or worsened the patch.
Stop tuning when
Do not keep chasing perfection after the signal is clear.
- The five-patch STL shows connected lines in center and corners.
- Another 0.02 mm Z step makes the patch worse.
- The problem follows one damaged plate area instead of settings.
- A normal small part completes its first layer without manual rescue.
Common setups
Jump to the branch that matches your machine or material
Bambu A1 poor first layer textured PEI Bambu A1, textured PEI, auto calibration Clean sheet and run five-patch test after calibration. Wash the textured PEI plate, then adjust live Z in 0.02 mm steps only if the patch still shows gaps or scraping. After changing nozzle Any printer after nozzle/hotend work Confirm nozzle seating, then run the patch before changing flow. Re-seat or heat-tighten the nozzle only if the five-patch test shows a new global Z shift; do not retune flow first. PETG sticking too hard to PEI PETG on smooth or very clean PEI Check Z squish and plate release guidance before raising bed temp. Add a release layer or switch plate surface before raising Z enough to ruin adhesion.
Copy before changing more settings
First-layer diagnostic brief
Fill this out after the first test so the next branch is based on evidence, not memory. The useful case is the one where only one variable changed.
Printer:
Slicer:
Firmware:
Material:
Nozzle size/material:
Bed surface:
Exact symptom:
Recent change:
First test run:
One change tested:
Result:
Next branch:Still not matching?
Jump to the next likely diagnosis
Problem Pattern
A weak first layer shows as gaps, loose strands, rough ridges, nozzle drag, or one corner behaving differently from the center. Auto leveling still needs a clean plate and a correct offset.
Likely Causes
- Build plate has skin oil, dust, old glue, or material residue.
- Z offset is too high, causing gaps and loose strands, or too low, causing scraping and ridges.
- Bed mesh, probe offset, or gantry alignment does not match the real plate position.
- First-layer speed, temperature, or extrusion width is too aggressive for the material and surface.
Print Context
- Applies to
- Auto bed leveling, PEI plates, Bambu, Prusa, Klipper, OrcaSlicer
- Best first move
- Clean the plate and run a one-layer patch before tuning the whole print.
- Do not start with
- Flow calibration while the nozzle height is visibly wrong.
After the test
Use the result, do not keep changing random settings.
If one check clearly changes the print, repeat that exact test once before moving on. If nothing changes, switch diagnosis instead of stacking more slicer edits.
Warnings
- A nozzle that is too low can damage build surfaces and create false over-extrusion symptoms.
- Auto bed leveling does not clean the plate or fix a wrong probe offset.
- Do not scrape a PEI coating aggressively while trying to fix adhesion.
Useful when
- A print that clearly shows poor first layer, especially if the same failure repeats.
- You want one next move instead of five profile edits.
Skip if
- The printer is showing a firmware, heater, or electrical safety warning.
- You are copying numbers from a different printer as final values.
More traps to avoid
- Changing several slicer settings at once and losing the actual cause.
- Ignoring filament condition or bed cleanliness while tuning advanced values.
- Keeping one global profile for different materials, brands, colors, and nozzle sizes.
Bench Note
Page: Poor First Layer Fix
Printer / firmware:
Slicer profile:
Filament brand and material:
Nozzle size:
Bed surface:
Recent changes:
First check run:
One change tested:
Result:FAQ
Is this a bed mesh problem?
Only if different plate areas behave differently after cleaning and center Z offset are correct.
Should I raise bed temperature?
Only after the first-layer pattern shows correct squish. Temperature cannot fix a nozzle that is too high or too low.
When should I replace the plate?
Replace it when coating damage or permanent contamination repeats after cleaning and correct Z setup.