Why won't my first layer stick to the bed?

Usually incorrect leveling, a dirty bed (clean with isopropyl alcohol), or a worn print surface — replacing it with a fresh PEI sheet usually fixes it.

Tips

15 3D Printing Tips to Improve Your Parts

From the first layer to post-processing: 15 practical tricks for fewer failed prints, cleaner surfaces and better quality on every 3D print.

Small adjustments make a huge difference in quality.

Before printing

Level the bed well.
Clean the bed with isopropyl alcohol.
Dry the filament.
Calibrate the temperature.

If the first layer still lifts even when leveled, the surface itself is usually the problem — a dual-sided PEI sheet fixes this in most cases.

After printing

Remove supports carefully.
Wet-sand for a smooth finish.
Use primer before painting.

Maintenance that prevents failures

A clogged nozzle is one of the most common causes of print failure — keeping a spare nozzle kit on hand avoids losing a whole day waiting for a replacement to arrive.