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Why is my first layer not sticking?
You start a print, and the plastic drags around, curls up or comes off on the nozzle. It's the most common beginner problem, and it's nearly always one of eight causes. Work through them in this order: the first ones are the quickest and the most likely.
Quick diagnosis
| What you see | Most likely cause | Jump to |
|---|---|---|
| Lines don't stick anywhere, or stuck fine last week | Dirty plate | Fix 1 |
| Round, separate lines that drag along behind the nozzle | Nozzle too high | Fix 2 |
| Sticks in one area, not another | Bed uneven or partly dirty | Fix 2 |
| First layer OK, but corners peel up later | Warping, cooling or drafts | Fix 4, Fix 6 |
| Popping or hissing sounds, rough bubbly lines | Damp filament | Fix 7 |
1. Clean the build plate (properly)
Oil from fingers is invisible and is one of the most commonly reported causes of prints not sticking in beginner forums. Wash a removable PEI plate with warm water and a little dish soap, rinse, and dry it without touching the print surface. Between washes, a wipe with isopropyl alcohol helps. Follow your printer maker's instructions for any special coating.
2. Check the nozzle height (Z offset) and leveling
If the nozzle is even slightly too high, the plastic is laid on top of the bed instead of being pressed into it. You want lines that are slightly flattened and touching each other. Run auto calibration (or level manually), then fine-tune the Z offset on a test layer. Step-by-step: how to level a 3D printer bed.
3. Use the right bed temperature
Check the temperature range printed on your filament spool or box. As a rough guide, PLA usually uses a bed around 55 to 65 °C and PETG around 70 to 85 °C, but brands vary. A bed that's too cool is a common reason PLA won't stick in a cold room. If you're printing PETG and wondering whether to switch, see PLA vs PETG.
4. Turn down cooling for the first layer
The part cooling fan helps upper layers, but blowing hard on the first layer can make it shrink and lift. Most slicers already keep the fan off or low for the first layer or two; check this setting if you've changed profiles.
5. Slow the first layer down
Slower lines have more time to bond. Most slicers have a separate "first layer speed" or "initial layer speed". Maker defaults are usually sensible; if you've been tweaking, put it back, or lower it a little.
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6. Block drafts
Air conditioning, a fan, an open window or a cold garage cools the edges of a print unevenly and lifts them. Move the printer, or use a box or enclosure around it. Lifting corners mid-print is covered in detail in how to fix warping.
7. Dry your filament
Many filaments absorb moisture from the air. Wet filament often pops, hisses or looks rough and bubbly, and it bonds poorly. PETG and TPU are especially prone to this. Drying it (in a filament dryer, or following the filament maker's oven guidance) usually helps. Damp filament also causes stringing.
8. Match the plate (and helpers) to the material
- Textured PEI: grips PLA and PETG well when clean, and leaves a nice texture on the bottom.
- Smooth PEI: very grippy for PLA. PETG can stick too well; many people use glue stick as a release layer.
- Brim: a thin border around the part that adds grip, especially for small or tall parts. It's a checkbox in most slicers, and you snap it off afterwards.
- Glue stick: a thin layer helps on some plates and materials. Check your printer maker's guidance first.
Still stuck?
Take a close-up photo of the first layer and compare it with the table in our first layer explainer. If you're still stuck, email us with a photo, your printer model and your filament; we may turn it into a future newsletter fix.
Your next step
Once your first layer sticks, go back to the first print checklist and finish your first successful print. If a part pops loose mid-print and the rest comes out offset, see how to fix layer shifting. Sticking fine now but the bottom edge bulges out? Read how to fix elephant's foot.
Frequently asked questions
Why is my 3D print not sticking to the bed?
The most common causes, roughly in order, are a dirty or greasy build plate, the nozzle being too high (Z offset), the wrong bed temperature, drafts or too much cooling on the first layer, and damp filament. Clean the plate first; it fixes a surprising number of cases.
What is the best way to clean a 3D printer bed?
For textured and smooth PEI plates, many makers recommend washing with warm water and dish soap, then drying, with isopropyl alcohol for quick wipes in between. Always check your printer maker’s advice, since some coated plates have specific instructions.
Should I use glue stick on my 3D printer bed?
Usually not for PLA on a clean PEI plate. Glue stick can help on smooth plates, with PETG (where it also acts as a release layer) or with small parts. Some makers, including Bambu Lab for certain plates, recommend it for specific materials, so check your printer’s guide.
Can the first layer be too close to the bed?
Yes. If the nozzle is too low, lines look thin, see-through or rough, the nozzle can scrape the plate, and the filament can jam. Raise the Z offset slightly.
Why does my first layer stick in some places but not others?
Usually the bed is not level in that area, or that part of the plate is dirty. Re-level or re-run auto calibration, and clean the whole plate.
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