Why won't my first layer stick? A troubleshooting checklist

When a print comes loose from the bed, curls at the corners, or turns into a nest of loose strands, start with the first layer. It usually fails because the plate is dirty, the nozzle is too high, or the bed is the wrong temperature. Start at the top of this list. Most people find the fix in the first three steps.

1. Clean the build plate

Fingerprints and dust keep plastic from sticking. Once the plate is cool, wash a removable plate with warm water and a little dish soap, rinse it, and dry it with a clean towel. For a bed that doesn't come off, wipe it with isopropyl alcohol. Check your printer's guide for its surface, then handle the plate by the edges.

2. Check the nozzle height

Watch the first lines go down. If they look round and sit on top of the bed like cooked spaghetti, the nozzle is too high. If they look thin and see-through, or the nozzle scrapes, it's too low. The line should be slightly flattened. Adjust the Z offset in small steps and try again.

3. Match the bed temperature to the material

Every filament has a recommended range printed on the spool or the maker's website. Stay inside it. A bed that's too cool lets corners lift; one that's too hot can make the bottom sag.

4. Slow the first layer down

A slower first layer gives plastic time to grab the plate. Many slicers already slow it for you. If yours doesn't, try half your normal speed for layer one.

5. Watch for drafts

A fan, an open window, or an air vent pointed at the printer can cool the edges of a print so fast that they curl. Move the printer or block the draft.

6. Add a brim for small or tall parts

A brim is a flat ring of extra lines attached around the base of the part. It gives small contact areas more grip, and it peels off afterward.

7. Check your filament and your plate

Filament that has soaked up moisture from the air can pop, string, and stick poorly. Store it sealed with a desiccant pack. Build plates wear out too; a shiny, worn patch where you print most often is a sign it's time for a new surface.

Still stuck? Take a photo of the first layer up close. The pattern of the lines tells you which of these fixes to try.

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