FIRST LAYER NOT STICKING TO THE BED
Filament curling behind the nozzle, lines that won't grab, prints peeling up after a few layers - first layer adhesion fails for a small set of reasons. Diagnose yours and fix it.
⚡ 5–10 minbeginnerhigh confidenceadhesionfirst layerbed leveling
Quick Fixes
Lower Z-offset 0.05 mm if lines are round and gappy
Wipe the bed with 90%+ IPA before every print
Re-level (manual or auto) at print temperature
Bed temp: PLA 60C, PETG 80C, ABS/ASA 110C
First layer speed 20-25 mm/s, flow 100%, width 110-120%
WHY THIS HAPPENS
A first layer bonds when three things line up at the same time: the nozzle is the right distance from the bed, the bed surface is clean and at the right temperature, and the extruded line is moving slowly enough to fuse against the surface before the next move pulls it away. Get any one of these wrong and the layer either never grabs or grabs weakly and lets go later.
The geometry matters more than people think. A line of plastic deposited at the correct gap looks like a flattened tube about 120% as wide as it is tall - the nozzle squashes the molten extrusion against the bed and forces it to spread laterally, increasing the contact area. If the gap is too large the line is round, only touches the bed at a single point per millimetre and bonds weakly. If the gap is too small there is no room for plastic to flow at all, the nozzle scrapes and the next nozzle pass pulls the under-extruded line right off the surface.
Surface energy decides whether plastic sees the bed as something to grip or something to bead off. Bare PEI has high enough surface energy for PLA and PETG to stick well. Glass without preparation does not - PLA prefers a release coating like glue stick, hairspray or a PEI sheet on top. A single fingerprint of skin oil drops the bonded area's surface energy enough that nothing sticks where you touched it. This is why two prints in a row using identical settings can have wildly different first layer behaviour.
WHEN THESE FIXES FAIL
Run through this checklist while watching a fresh first layer:
**If the lines are round and barely touching each other** - Z-offset is too high. Lower the nozzle 0.05 mm and retry.
**If the nozzle is scraping the bed and the lines look transparent or absent** - Z-offset is too low. Raise the nozzle 0.05 mm.
**If the centre prints fine but the corners don't** - the bed is not trammed. Re-level.
**If the print sticks then lifts after 3-5 layers** - bed is too cold or there is no adhesive on a release-prone surface (glass, smooth PEI with PETG).
**If lines smear and look wider than they should** - bed is too hot, melting the first layer beyond the model boundary (this is also elephant foot).
**If the same spot fails every print** - that part of the bed is dirty or warped. Clean with IPA, and if that doesn't help, check for a dent or low spot with a straightedge.
MOST LIKELY CAUSES
1
Z-offset too high
high confidence
The nozzle is too far from the bed, so the first layer lands round instead of being squished into the surface.
→ Lower Z-offset by 0.05 mm if first-layer lines are round and gappy
→ Adjust live-Z in 0.02-0.05 mm steps during a first-layer test
→ Set first layer speed to 20-25 mm/s
2
Dirty bed surface
high confidence
Fingerprints, dust, and oils reduce adhesion, causing filament to bead up or lift even when temperatures are correct.
→ Wipe the bed with 90%+ IPA before every print
→ Wash the build plate with warm dish soap and water if IPA does not restore adhesion
→ Avoid touching the print area after cleaning
3
Bed not level or mesh is off
medium confidence
One area of the bed may have the correct nozzle gap while another is too high or too low.
→ Re-level the bed at print temperature
→ Run a fresh auto-bed-level mesh
→ Check the first layer at the four corners and center before starting long prints
WANT SETTINGS TUNED FOR THIS ISSUE?
Generate slicer settings based on your printer, filament, and this exact problem.
Generate SettingsWhat It Looks Like
Filament rolls around in front of the nozzle instead of bonding to the bed, or the print sticks for a few layers then lifts and gets dragged around the build plate.
Why It Happens
A first layer bonds when three things line up at the same time: the nozzle is the right distance from the bed, the bed surface is clean and at the right temperature, and the extruded line is moving slowly enough to fuse against the surface before the next move pulls it away. Get any one of these wrong and the layer either never grabs or grabs weakly and lets go later.
The geometry matters more than people think. A line of plastic deposited at the correct gap looks like a flattened tube about 120% as wide as it is tall - the nozzle squashes the molten extrusion against the bed and forces it to spread laterally, increasing the contact area. If the gap is too large the line is round, only touches the bed at a single point per millimetre and bonds weakly. If the gap is too small there is no room for plastic to flow at all, the nozzle scrapes and the next nozzle pass pulls the under-extruded line right off the surface.
Surface energy decides whether plastic sees the bed as something to grip or something to bead off. Bare PEI has high enough surface energy for PLA and PETG to stick well. Glass without preparation does not - PLA prefers a release coating like glue stick, hairspray or a PEI sheet on top. A single fingerprint of skin oil drops the bonded area's surface energy enough that nothing sticks where you touched it. This is why two prints in a row using identical settings can have wildly different first layer behaviour.
What The Community Data Says
Based on 454 confirmed fixes from r/FixMyPrint - the largest first-layer dataset across all categories - here are the most common causes ranked by how often they actually worked:
1. Z-offset too high - by far the most common confirmed fix. Lowering the nozzle 0.05-0.1 mm solved it for most users.
2. Dirty bed - cleaning with 90%+ isopropyl alcohol resolved a huge slice of cases, especially after the user had been handling the build plate.
3. Bed not trammed (manual or auto) - one corner or the centre was high or low. Re-running auto bed levelling or manually tramming with a sheet of paper fixed it.
4. Bed temperature too low - especially for PETG, ABS and ASA. Raising bed temp by 5-10C was the single setting change that worked.
5. First layer speed too fast - dropping to 20-25 mm/s gave the line time to bond.
Data sourced from r/FixMyPrint - one of the largest 3D printing troubleshooting communities on Reddit. This represents real user-reported issues and community-confirmed fixes, not theoretical advice.
How To Diagnose Your Specific Cause
Run through this checklist while watching a fresh first layer:
If the lines are round and barely touching each other - Z-offset is too high. Lower the nozzle 0.05 mm and retry.
If the nozzle is scraping the bed and the lines look transparent or absent - Z-offset is too low. Raise the nozzle 0.05 mm.
If the centre prints fine but the corners don't - the bed is not trammed. Re-level.
If the print sticks then lifts after 3-5 layers - bed is too cold or there is no adhesive on a release-prone surface (glass, smooth PEI with PETG).
If lines smear and look wider than they should - bed is too hot, melting the first layer beyond the model boundary (this is also elephant foot).
If the same spot fails every print - that part of the bed is dirty or warped. Clean with IPA, and if that doesn't help, check for a dent or low spot with a straightedge.
Fixes By Cause
Cause 1: Z-offset wrong
Adjust live during a first layer print using your printer's baby-step or live-Z function. Adjust in 0.02-0.05 mm increments. Target: lines slightly flattened, touching each other along their full length, no visible gaps.
Cause 2: Dirty bed
Wipe with 90%+ IPA and a clean lint-free cloth before every print. For stubborn oils on smooth PEI, wash with warm dish soap and water every 10-20 prints. Don't touch the surface after cleaning.
Cause 3: Bed not trammed
For manual: paper-drag method at 5 points (4 corners + centre). For auto: run a fresh mesh and check the deviation - more than 0.4 mm range usually means the bed needs physical levelling first. Heat the bed to print temperature before levelling so thermal expansion is accounted for.
Cause 4: Bed temperature too low
PLA: 55-65C. PETG: 75-85C. ABS/ASA: 100-110C. TPU: 30-50C. Set first layer bed temp 5C above the layer-2+ bed temp for an extra adhesion boost.
Cause 5: First layer speed too fast
Set to 20-25 mm/s regardless of normal print speed. Set first layer flow to 100% (no reduction) and first layer line width to 110-120% to widen the contact area.
Printer-Specific Notes
Bowden printers (Ender 3, CR-10, Sovol): Manual bed levelling is the norm. Re-level after every move and after a few weeks of regular printing - the springs sag. Add silicone bed levelling spacers for a more stable level that holds.
Direct drive printers (Bambu, Prusa MK4S, Voron): Auto bed levelling handles tramming digitally but doesn't fix a physically warped or tilted plate. If your mesh shows a 1+ mm range across the bed, the plate itself is warped - replace it.
Enclosed printers (Bambu P1S, K1 Max): The chamber temperature affects the first layer differently than open-air printers - bed temp can be 5-10C lower than open-air recommendations for PLA because the chamber holds the heat. For ABS the enclosure makes the first layer dramatically more reliable - aim for chamber 35-45C before starting.
Filament-Specific Notes
PLA / PLA+: Sticks to bare textured PEI without any aid. Bed 60C, first layer speed 25 mm/s. If using glass, add glue stick or hairspray - bare glass is unreliable for PLA.
PETG: The opposite problem - sticks too well to bare PEI and can rip chunks out of the surface. Use a thin layer of glue stick as a release agent on PEI. Bed 80C. Don't squish the first layer as aggressively as PLA - PETG hates being over-compressed.
ABS / ASA: Needs 100-110C bed and benefits from an enclosure. Use ABS slurry (ABS scraps dissolved in acetone) or Magigoo PA on the bed. Glue stick works in a pinch but is less reliable for big parts.
TPU: Bed 30-50C. Slow first layer (15-20 mm/s). TPU sticks aggressively to PEI - use glue stick as a release agent if you can't get prints off without damaging the bed.
How To Prevent It Next Time
Wipe the bed with IPA before every print - this single habit eliminates the largest single cause of first-layer failure.
Run a 1-layer first-layer test square (search Printables for 'first layer test') after any major change - new filament, new bed surface, after moving the printer. It takes 5 minutes and catches Z-offset and tramming issues before they ruin a 12-hour print.
Keep an eye on bed surface wear. PEI loses adhesion as it scratches and ages - flip it or replace it every 100-200 prints depending on use.
Get An Exact Fix For Your Setup
Use FixMyPrint to get settings tuned for your specific printer and filament - based on what actually worked for similar issues in the community. The engine returns Z-offset baseline, first-layer speed, first-layer bed temp and first-layer flow as one ready-to-paste profile, all clamped to safe ranges for your material.
Go to /settings-generator to generate yours.
Recommended Slicer Settings
Related Guides
Warping and Corner Lifting
Corners curling up off the bed mid-print? Warping is differential cooling shrinkage. Fix it with bed temperature, brim, enclosure and adhesion.
⚡ 10–25 minbeginnerhigh confidencewarpingadhesion
Elephant Foot (Bulging First Layers)
Base of your print bulging out wider than the rest? That's elephant foot. Fix it with Z-offset, slicer compensation and first-layer temperature.
⚡ 5–10 minbeginnerhigh confidenceelephant footfirst layer
Rough or Pillowing Top Surface
Bumpy, wavy or pitted top surfaces happen when top layers can't bridge the infill cleanly. Fix top layers, infill density, cooling and speed for a smooth finish.
⚡ 10–20 minbeginnerhigh confidencetop surfacepillowing
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