Learn · updated 2026-09-24
Why won't my first layer stick?
Short answer
Most first-layer failures are nozzle height, a dirty plate, or a bed temperature mismatched to the filament. Modern levelling hardware fixes the height part automatically; nothing fixes a plate with fingerprints on it.
It is the most common problem by a wide margin
Across archived owner discussions, first-layer and bed-adhesion problems appear more than twice as often as the next most common topic. That is worth knowing when comparing printers, because it means the levelling system is the feature most likely to determine whether a machine is pleasant to own — more than its speed rating, and more than its build volume.
What the levelling hardware is doing
There are four approaches in this catalogue. A touch probe taps the bed at a grid of points and builds a mesh. A strain gauge or loadcell senses the nozzle itself contacting the plate, which removes the probe-to-nozzle offset that has to be calibrated separately on probe systems. Eddy-current scanning reads the metal bed continuously without touching it, which is faster and repeatable. Lidar adds an optical scan of the first layer after it is laid down. Strain-gauge and loadcell systems are the ones that eliminate manual Z-offset tuning, which is the calibration step people most often get wrong.
What it cannot fix
No levelling system compensates for a contaminated plate. Skin oils from handling the sheet are the single commonest cause of a print that lifts in one corner, and the fix is soap and water, then isopropyl alcohol. Nor does levelling fix a bed temperature wrong for the material: PLA wants roughly 60 °C, PETG around 80 °C, ABS 100 °C or more, and a printer whose bed tops out at 80 °C cannot hold ABS down no matter how flat it is. That is why the bed's maximum temperature is worth reading alongside the levelling spec.
The build surface matters too
Textured PEI is forgiving and grips well without adhesive; smooth PEI gives a glossy bottom surface but is fussier. Most printers here ship with a dual-sided flexible spring steel sheet, so you get both. Flexible sheets also solve removal, which is the other half of the adhesion problem — a part that will not come off is as much of a failure as one that never stuck.