Why Won't My First Layer Stick? (And How to Fix It)
A failed first layer kills the entire print. This guide covers every cause — bed leveling, Z offset, surface prep, temperature, and speed — so your prints stick every time.
If your first layer doesn't stick, nothing else matters. A good first layer is slightly squished into the bed, forms a smooth surface, and doesn't peel up at the corners. Here's how to get there.
Cause 1: Bed Is Not Level (Most Common)
An uneven bed means parts of the nozzle are too high (gaps, no adhesion) and parts are too low (nozzle drags, clogging).
How to level manually
- Heat bed to print temperature (cold leveling is inaccurate)
- Home the printer
- Move nozzle to each corner and center
- Adjust until a piece of paper slides with slight resistance under the nozzle at every point
Auto bed leveling (ABL)
If your printer has a BLTouch, CR Touch, or built-in strain gauge (Bambu, Prusa MK4), make sure you run the leveling routine after every few prints or when the printer is moved.
Cause 2: Z Offset Is Wrong
Z offset controls how close the nozzle is to the bed on the first layer. Too high = filament doesn't stick. Too low = nozzle scrapes the bed and clogs.
Signs of wrong Z offset:
- Gaps between lines → raise nozzle (increase Z offset value)
- Squished flat, no defined lines → lower nozzle (decrease Z offset value)
- Round cross-section on lines → nozzle is too high
- Lines fusing into a solid sheet → nozzle is about right (for smooth surfaces)
The goal: First layer lines should be slightly oval/flat, fused together, with no gaps.
Cause 3: Bed Surface Issues
| Surface | Best For | Prep |
|---|---|---|
| PEI (textured) | PLA, PETG, ABS | Wipe with IPA before each print |
| PEI (smooth) | PLA, TPU | Wipe with IPA; PETG needs release agent |
| Glass | PLA | Use glue stick; clean with IPA |
| BuildTak | Most materials | Replace when worn |
PETG on PEI warning: PETG sticks too well to smooth PEI. It can tear chunks off the surface. Use a thin layer of glue stick, hairspray, or PVA as a release agent.
Cause 4: Temperature Too Low
Cold beds = poor adhesion for most materials.
| Material | Bed Temp |
|---|---|
| PLA | 55–65°C |
| PETG | 70–80°C |
| ABS | 100–110°C |
| ASA | 100–110°C |
| TPU | 40–60°C |
Cold nozzle temperature also reduces first layer adhesion. Some slicers let you set a higher "first layer temperature" (+5–10°C) to improve bonding.
Cause 5: First Layer Speed Too Fast
Slow down your first layer. A slower speed gives the filament more time to bond to the bed.
Recommended first layer speed: 20–30mm/s (regardless of your normal print speed)
In Cura: Initial Layer Speed In PrusaSlicer: First Layer Speed
Cause 6: Dirty Bed
Oils from your fingers, dust, and residue from previous prints all reduce adhesion.
- Wipe with 90%+ isopropyl alcohol before every print
- Don't touch the print surface with bare hands
- For stubborn residue, wash with dish soap and warm water, then re-IPA
Cause 7: Filament Absorbing Moisture
Wet filament doesn't bond well. If you've tried everything else and still have adhesion issues, dry your filament:
- PLA: 4 hrs at 45–50°C
- PETG: 4–6 hrs at 65°C
- ABS: 4 hrs at 80°C
Quick Checklist
- Bed leveled at print temperature
- Z offset adjusted (first layer lines slightly squished, no gaps)
- Bed surface clean (IPA wipe)
- Bed temperature correct for material
- First layer speed 20–30mm/s
- First layer height set to 0.2–0.3mm
- Filament dried if needed