When PLA will not stick to the bed, the first layer lifts, beads up, or drags under the nozzle instead of bonding. PLA grips a warm sheet easy, so a lift almost always means the bed is too cold, too dirty, or out of level. Bambu’s first-layer guide and the IC3D PLA datasheet both point there.
A bad first layer fails the whole print, so fix it before the part grows tall. Work the list in order and reprint a single PLA layer after each change.
PLA holds well at a bed around 55 to 60 C, per Bambu’s PLA page, far cooler than PETG needs.
What causes it
| Likely cause | Fix | Severity |
|---|---|---|
| Bed too cold | Set the bed to 55 to 60 C, the range PLA needs to bond. | hi |
| Bed dirty | Wipe the sheet with isopropyl alcohol so oil and dust do not break the bond. | hi |
| Bed not level | Level for a light paper drag at all four corners and the center. | md |
| Z-offset too high | Lower the Z-offset a touch so the first layer presses into the sheet. | md |
| Wet PLA | Dry the spool at 40 to 50 C, then reprint. Wet PLA lays down rough. | lo |
Fast fixes to try first
Print a flat one-layer PLA square and lift a corner to test the grip, then work top to bottom and reprint after each step.
Raise the bed
Set the bed to 55 to 60 C so the PLA has the heat it needs to bond.
Clean the sheet
Wipe the sheet with isopropyl alcohol to remove oil, dust, and old glue.
Level the bed
Heat the bed, then set a light paper drag at all four corners and the center.
Lower the Z-offset
Drop the Z-offset a small step so the first layer presses into the sheet.
If the quick fixes stall
When heat and a clean sheet do not hold the layer, the surface and the filament are next.
Try a textured sheet
Textured PEI grips PLA well and releases the print clean.
Slow the first layer
Drop the first layer to about 20 mm/s so the PLA has time to bond.
Dry the PLA
If the layer looks rough, dry the spool at 40 to 50 C and reprint.
How PLA differs
PLA sticks the easiest of the common filaments, because it prints cool and grips a warm sheet with no enclosure. It needs only a 55 to 60 C bed, where PETG wants 80 to 90 C and ABS wants 90 to 100 C and an enclosure. PLA is also the least hygroscopic, so wet PLA is a smaller factor than wet PETG, though a damp spool still lays a rough first layer.
Mistakes that lift the PLA layer
A few choices trade one problem for another.
Avoiddo not
- Printing PLA on a cold bed, below 50 C.
- Wiping the sheet with a dirty cloth or finger oils.
- Lowering the Z-offset so far the first layer ripples.
- Changing bed temp, level, and Z-offset at once.
Key takeaways
- PLA will not stick when the bed is too cold, dirty, or unlevel.
- Set the bed to 55 to 60 C, clean it, and level it first.
- PLA grips easier than PETG or ABS and needs no enclosure.
- Change one thing and reprint a single layer.
For the bed-adhesion angle, the PLA bed adhesion guide goes deeper, and the PLA hub covers the material in depth.
Related guides
Related
More in this area
Cross-reference
Sources & methodology
3 citations · reviewed 2026-07-10- 01Bambu Lab Wiki: First layer not sticking (plate, level, Z-offset)accessed 2026-07-09Tier 1
- 02Bambu Lab PLA Usage Guide (wiki): PLA bed temperatureaccessed 2026-06-29Tier 1
- 03IC3D Standard PLA Technical Data Sheet (TDS PDF)accessed 2026-06-29Tier 1