3D Print Not Sticking to the Bed? Work Through These Fixes

A first layer that lifts, curls, or skates around the bed is the most common failure in FDM printing, and it’s almost always one of a short list of causes. Work through these in order. The first three fix the large majority of cases, so don’t reach for glue and rafts before you’ve checked them.

1. Clean the Bed

Finger oils are invisible and they wreck adhesion. Every time you pop a part off and handle the plate, you leave fresh prints behind.

• Wipe the surface with 90%+ isopropyl alcohol (IPA) and a lint-free cloth or paper towel. Let it flash off for 30 seconds before you print.
• For PEI and glass, wash periodically with warm water and a drop of dish soap. That cuts the buildup that IPA just smears around. Rinse well, dry, and keep your fingers off the surface afterward.
• Handle the plate by the edges. If you have to touch the middle, re-wipe with IPA.

This one step solves a surprising number of “sudden” adhesion problems on a printer that ran fine last week.

2. Re-Level and Set Z-Offset

If the nozzle sits too high, plastic lands as a loose round noodle instead of getting squished into the surface. This is the single biggest mechanical cause.

1. Heat the bed and nozzle to printing temperature first. Metal expands, so level hot.
2. Run the paper-drag test: slide a sheet of standard printer paper under the nozzle at each corner. You want light, consistent friction. The paper drags but still moves.
3. If your printer has a Z-offset, dial it in during the first layer. The extruded line should look slightly flattened with no gaps between passes, not a raised bead.

Too low causes its own trouble. If nothing extrudes, or the line looks scraped and translucent, back the nozzle off a few hundredths of a millimeter.

3. Slow Down and Fatten the First Layer

A fast first layer doesn’t give the plastic time to bond.

• Set first-layer speed to 20-25 mm/s, even if the rest of the print runs at 60+.
• Use a first-layer height of 0.2-0.3 mm. A very thin 0.1 mm first layer is far less forgiving of any leveling error.
• A first-layer line width of 110-120% gives you more surface contact.

4. Match Bed Temperature to the Material

Too cold and the first layer won’t tack down. Reasonable starting points:

• PLA: 55-60 C
• PETG: 70-80 C
• ABS/ASA: 100-110 C, and these want an enclosure
• TPU: 40-50 C

If the edges are lifting, bump the bed 5 C. Then check the spool. Manufacturers print a recommended range on it, and the ranges vary between brands.

5. Add an Adhesion Aid

Match the aid to your plate:

• Glass or smooth PEI: a thin, even coat of glue stick (PVA). It also protects the surface from PETG, which otherwise bonds hard enough to chip the plate when you remove a part.
• Painter’s tape (blue): good for PLA on printers without a heated bed.
• Textured PEI: usually needs nothing for PLA, but a light glue coat helps PETG release cleanly.

More glue is not better. A thin haze beats a thick gummy layer every time.

6. Kill Drafts and First-Layer Cooling

A cold breeze across the bed chills the plastic before it bonds. ABS and ASA are the worst offenders and warp easily.

• Print ABS/ASA in an enclosure. At minimum, move the machine out of a drafty hallway or away from an open window.
• Set the part-cooling fan to 0% for the first 1-3 layers in your slicer. Most profiles already do this, but confirm it.

One safety note: ventilate the room when you run ABS or ASA. The fumes aren’t pleasant and shouldn’t be breathed in a sealed space. An enclosure helps with warping, but it isn’t a reason to seal yourself in with the fumes.

7. Check for a Warped Bed

If the center sticks but the corners lift no matter how you level (or the reverse), the plate itself may be bowed.

• Lay a metal ruler or straightedge across the bed and look for light gaps underneath.
• Enable mesh bed leveling (auto bed leveling, or ABL) if your firmware supports it. The machine then compensates for the warp in software.
• A removable spring-steel sheet that’s been over-flexed can hold a permanent curl. Try flattening it, or swap in a fresh one.

8. Use a Brim or Raft for Small Footprints

Tall, skinny parts with a tiny contact patch will pop loose even on a perfect bed.

• Add a brim of 5-8 mm in your slicer. It’s a flat skirt fused to the base of the part. It adds grip and peels off after.
• Use a raft only for severe warping or a genuinely rough bed. It wastes plastic and can scar the bottom face.

The Takeaway

Run it as a checklist, top to bottom: clean, level, slow the first layer, then temperature. Change one variable at a time and watch that first layer go down. If the lines come out flat and fused with no gaps, the rest of the print follows. Log what fixed it in your Gyroid notes, so next time the same part and filament start right on the first try.