How to Fix First Layer Problems on Bambu Lab Printers
A bad first layer shows up as patches that don't stick, lines that don't fuse together, or a bottom surface that looks rough and uneven. Since everything else is built on top of it, fixing the first layer fixes a surprising number of 'random' print failures.
Why the first layer fails
The first layer is squeezed directly onto the plate, so it is sensitive to things no other layer cares about: surface grease, plate levelness, how hot the plate and nozzle are on that single layer, and how fast the nozzle moves while laying it down. Bambu printers automate the levelling, but the rest is still on you and your profile.
Quick fixes
Wash the plate. Dish soap and warm water, then dry with a clean towel. Grease from fingertips is the most common cause of patchy first layers, and IPA alone smears it instead of removing it. Touch the plate only by its edges.
Slow the first layer to 20 mm/s. The Bambu default is 50 mm/s, which is fine on a perfect surface but unforgiving otherwise. At 20 mm/s the plastic has time to be pressed into the plate texture.
Warm up the first layer. Raise the first-layer plate temperature about 5 °C above default (PLA up to 60–65 °C, PETG 80–85 °C, ABS 95–100 °C, PA 100–105 °C). For PLA and PETG a +5 °C bump on the first-layer nozzle temperature also helps the plastic flow out and bite.
Re-run calibration after any plate change. Trigger a full calibration / bed levelling whenever you swap plates, and check the plate sits flush on the heatbed — a stray blob of old filament under the back edge tilts the whole surface. Wipe leftover plastic off the nozzle tip before starting, too; one dangling blob can wreck the entire layer.
Advanced tuning
- Uneven adhesion on one side only? On the X2D, H2D, X1C, X1E and P1S, the auxiliary side fan starts blowing right after the first layers and hits one side of the plate hardest. If prints let go on the side facing that fan, lower its speed (Filament settings → Cooling → Auxiliary part cooling fan).
- Pick your plate for looks. Textured PEI hides small first-layer flaws; smooth PEI shows every line. If the bottom finish keeps bugging you, switching to textured is easier than chasing perfection.
- Squished-out edges on layer one are a different problem — that’s elephant foot, fixed with compensation rather than adhesion tweaks.
- Check the plate/material pairing. A first layer cannot stick to a plate the profile has disabled (bed temperature 0 in the stock profile means “unsupported combination”). PETG on the Cool Plate and TPU on the SuperTack are the classic traps — details in our bed adhesion guide.
Material notes
- PLA: 55 °C bed on PEI plates is the stock value; it rarely needs more than 60–65 °C.
- PETG: likes heat on layer one — 80 °C beds and a slightly hotter nozzle. On smooth PEI, always use a film of glue stick as a release agent.
- ABS/ASA: a first layer that lets go mid-print usually means the plate is too cold; ABS runs 90–100 °C, ASA 100 °C.
- PA (nylon): needs roughly 100–105 °C on the first layer to stick at all, plus glue.
How to read your first layer
Watch the first layer go down (or inspect the bottom of a finished print) and it tells you what to fix:
- Lines that stay round and separate, like spaghetti lying side by side — not enough squish or heat. Slow down, warm up.
- Lines fused into a smooth, even sheet — that’s the goal. Stop tuning.
- A rippled, ploughed-looking surface where the nozzle drags through excess plastic — too much squish or too much flow; if the bottom edge also bulges outward, read the elephant foot guide.
- Good in some areas, failed in others — almost always plate contamination (wash it) or a plate not sitting flush on the heatbed.
Frequently asked questions
What is the most common cause of a patchy first layer?
Grease on the build plate — fingertip grease causes more patchy first layers than any slicer setting, and IPA alone smears it instead of removing it. Wash the plate with dish soap and warm water, dry it with a clean towel, and touch it only by the edges. If the layer is good in some areas and failed in others, contamination or a plate not sitting flush is almost always the reason.
What first-layer speed and temperatures should I use on a Bambu printer?
Slow the initial layer to 20 mm/s (the Bambu default is 50 mm/s) so the plastic has time to be pressed into the plate texture, and raise the first-layer bed temperature about 5 °C above default: PLA up to 60–65 °C, PETG 80–85 °C, ABS 95–100 °C, PA 100–105 °C. For PLA and PETG, a +5 °C bump on the first-layer nozzle temperature also helps.
When should I re-run calibration on a Bambu printer?
After every plate change — trigger a full calibration whenever you swap plates, and check that the plate sits flush on the heatbed, since a stray blob of old filament under the back edge tilts the whole surface. Also wipe leftover plastic off the nozzle tip before starting; one dangling blob can wreck the entire first layer.
Not sure which of these fixes applies to your print?
Answer five quick questions about your printer, filament and build plate, and our rule engine turns them into a prioritized fix list with exact slicer values — the same knowledge these guides are written from.
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- First Layer Not Sticking: Causes and Solutions — Bambu Lab Wiki
- Manual Bed Leveling / Manual Bed Tramming — Bambu Lab Wiki