Getting a Perfect First Layer with PLA
PLA is the most forgiving material to lay a first layer with, which makes it the perfect training ground: master the PLA first layer and you have learned to read squish, speed and temperature for every material that follows.
The stock numbers
Bambu’s PLA profile lays the first layer with the nozzle at 220 °C and the bed at 55 °C on textured PEI (35 °C on the Cool Plate, 40 °C on SuperTack). Vendor baselines elsewhere sit in the same neighbourhood — Elegoo’s PLA profile, for instance, starts its first layer at 210 °C. These defaults are correct for a clean plate; when the first layer struggles, change the conditions before the numbers.
Preparation beats tuning
Wash the plate with dish soap and warm water, dry with a clean towel, and handle it by the edges. A greasy plate causes more bad PLA first layers than every slicer setting combined.
Re-run calibration after every plate change and confirm the plate snaps flush onto the bed with nothing trapped underneath. Wipe old filament off the nozzle tip — a hanging blob ploughs a trench through the new layer.
Slow down to 20 mm/s when in doubt. Stock profiles lay first layers around 50 mm/s, which is fine on a perfect plate and merciless otherwise. Slower lines get pressed in rather than dragged along.
Reading a PLA first layer by eye
- Rounded, separate strands that you can peel apart: not enough squish or heat. Nudge the first-layer nozzle temperature up ~5 °C (PLA responds well between 210 and 235) or slow the layer down.
- A fused, even sheet with faint line boundaries: the goal. Leave everything alone.
- Ridges the nozzle ploughs through, translucent thin patches: too much squish or flow. If the part’s bottom edge also flares outward, that’s elephant foot territory.
- Perfect in one region, failing in another: contamination or a plate not sitting flat — a settings change cannot fix a geometry problem.
PLA-specific notes
- Bed ceiling: 65 °C. PLA softens around 45 °C; run the bed much past that and the base stays rubbery, which reads as a mushy, wavy first layer and flared edges.
- Full fan from layer two. PLA’s profile holds the fan off only for the first 1 layer, then runs 100 %. That is normal and not a first-layer risk with PLA.
- Old spools print worse first layers. Damp PLA bonds weakly and looks dull; dry
8 h at 55 °Cif the spool has months of shelf time. More in the drying guide.
Cross-material first-layer theory — leveling systems, z-offset machines, plate choices — lives in the first layer guide and the calibration walkthrough. Everyday PLA values: the PLA settings guide.
Frequently asked questions
What temperature should the first layer be for PLA?
Bambu’s PLA profile lays the first layer with the nozzle at 220 °C and the bed at 55 °C on textured PEI (35 °C on the Cool Plate, 40 °C on SuperTack); Elegoo’s profile starts its first layer at 210 °C. If strands stay rounded and separate, nudge the first-layer nozzle temperature up about 5 °C — PLA responds well between 210 and 235 °C.
What ruins most PLA first layers?
A greasy plate — grease from fingertips causes more bad PLA first layers than every slicer setting combined. Wash the plate with dish soap and warm water, dry it with a clean towel and handle it by the edges. When in doubt, also slow the first layer to 20 mm/s (stock profiles run about 50 mm/s) so lines get pressed in rather than dragged along.
How hot can I run the bed for PLA?
Keep it at or below 65 °C. PLA softens around 45 °C, so running the bed much past that leaves the base rubbery, which reads as a mushy, wavy first layer with flared edges. The stock 55 °C on PEI plates rarely needs more than 60–65 °C, and full fan from layer two is normal for PLA — not a first-layer risk.
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- First Layer Not Sticking: Causes and Solutions — Bambu Lab Wiki
- Manual Bed Leveling / Manual Bed Tramming — Bambu Lab Wiki
- OrcaSlicer vendor profiles — SoftFever/OrcaSlicer (GitHub)