How to Get PLA to Stick to the Bed

PLA on a clean textured PEI plate needs no glue, no hairspray, no tricks — it just sticks. So when PLA doesn't stick, resist the urge to add adhesives and find out what broke instead. It is a short list.

Work the list in order

1. Wash the plate with dish soap and warm water. The single most common cause. Every fingertip that touches the plate leaves oil; IPA wipes move it around, soap removes it. Dry with a clean towel and handle by the edges. If prints stuck when the plate was new, assume grease until proven otherwise.

2. Check the bed temperature. Bambu’s stock PLA values: 55 °C on textured PEI, 35 °C on the Cool Plate, 40 °C on SuperTack. Weak adhesion responds to +5 °C, but stop at 65: PLA softens around 45 °C, and past that the cure becomes elephant foot. Other vendors’ PLA baselines run 45–65 °C beds; the physics is the same everywhere.

Filament settings → Filament (bed temperature row for your plate)

3. Slow the first layer to 20 mm/s. Fast first layers skate over the plate instead of pressing in. Most stock profiles lay the first layer at 50 mm/s, which assumes a perfect surface; halving it (or less) buys bite on an imperfect one.

Process → Speed → Initial layer

4. Re-run bed leveling / full calibration after swapping plates, and make sure the plate sits flush — a blob of old filament under the back edge tilts everything. Wipe the nozzle tip too; a dangling blob ploughs through the fresh first layer.

Plate pairings worth knowing

If it still won’t stick

Three less-common culprits, in descending order: a worn plate — PEI does fade after hundreds of cycles, and a years-old sheet that fails the soap test twice deserves replacement; a drafty room — PLA tolerates a lot, but a cold stream of air across the plate edge cools the corners below bonding temperature; and old, damp filament — wet PLA bonds worse and prints dull; dry it 8 h at 55 °C. Whatever you do, keep it boring: PLA adhesion is a solved problem, and every additive workaround (glue, tape, hairspray) mostly hides one of the fixable causes above. Cross-material adhesion theory: the main guide. First-layer reading skills: the PLA first layer guide.

Frequently asked questions

Why did my PLA suddenly stop sticking to the bed?

The most common cause is grease: every fingertip that touches the plate leaves oil, and IPA wipes only move it around. Wash the plate with dish soap and warm water, dry it with a clean towel and handle it by the edges. If prints stuck when the plate was new, assume grease until proven otherwise — PLA on clean textured PEI needs no glue or tricks.

What bed temperature and first-layer speed make PLA stick?

Bambu's stock PLA values are 55 °C on textured PEI, 35 °C on the Cool Plate and 40 °C on SuperTack. Weak adhesion responds to +5 °C, but stop at 65 °C — PLA softens around 45 °C, and past that the cure becomes elephant foot. Also slow the first layer to 20 mm/s; most stock profiles run 50 mm/s, which skates over an imperfect plate instead of pressing in.

Should I use glue stick or hairspray for PLA?

No — PLA adhesion is a solved problem, and adhesives mostly hide one of the fixable causes: a greasy plate, wrong bed temperature, a too-fast first layer or bad leveling. If it still fails after those, suspect a worn plate (PEI does fade after hundreds of cycles), a drafty room, or damp filament — dry old PLA 8 hours at 55 °C. A glue film only makes sense on engineering-type plates.

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