If an FDM print will not stick from its first lines, check the build surface, plate seating, first-layer setup, and filament profile. If the first layer holds but corners curl as the print grows, focus on cooling, drafts, material shrinkage, and contact area. Those symptoms can overlap, but they call for different fixes.
First, identify when the failure starts
Watch the skirt or the first lines around the model. If they fail to adhere immediately, start with surface cleanliness, plate seating, leveling or mesh calibration, nozzle-to-bed distance, extrusion, and the selected material profile. A skirt can expose a first-layer problem before the model itself is underway.
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If the first layer is sound but corners lift several layers later, investigate shrinkage as the part cools, drafts, ambient temperature, model geometry, and whether the filament is prone to warping. A print can also have both problems: a marginal first layer leaves less grip to resist later contraction.
Clean and inspect the build plate
Remove stuck filament and debris, then clean grease from the surface using the plate maker’s instructions. Cleaning methods vary: Prusa recommends wiping relevant print surfaces with IPA 90% or higher, while UltiMaker’s S6 manual distinguishes between IPA for flexible plates and water, with detergent if needed, for glass. Do not assume that a solvent or adhesive suitable for one plate is safe for another.
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- Check that the sheet is flat, undamaged, and seated correctly.
- Look for trapped filament or debris beneath the sheet that could change its position.
- Clean both nozzle and plate before leveling or calibrating.
- Use glue only where the printer, plate, or filament manufacturer recommends it. UltiMaker advises applying glue as recommended and using it on a flexible plate only when specifically recommended for that material.
Prusa’s warping guidance and the UltiMaker S6 manual show why surface-care instructions should be matched to the particular build surface.
Correct the first layer without over-squishing it
Begin with the correct printer and filament profile, then check leveling or mesh calibration and first-layer height. The line should lie down evenly and bond to the surface, but pushing the nozzle too close is not a universal adhesion fix. Excessive squish can damage a sheet; Prusa specifically warns that lowering Live Adjust Z too far can damage its steel sheet.
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Keep the profile’s nozzle and bed temperatures as your baseline. If adhesion remains poor, make gradual adjustments within the filament maker’s recommendations. In its first-layer guidance, Prusa says a 5–10 °C bed-temperature increase can be tried for experimental materials; that is not a universal instruction for every filament. Prusa also suggests trying about 75% print speed for the first three layers after other checks, a recommendation for its printers and workflow rather than a general speed rule.
See Prusa’s first-layer troubleshooting guide for its calibration and adjustment advice.
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Add first-layer contact area for small bases and lifting corners
A brim adds a flat border around the model, increasing the area that touches the plate. It is a practical next step for a tall object with a small footprint, several small parts, or corners that begin lifting. Prusa’s brim guide generally advises a width of at least 3 mm; the useful width still depends on the model and slicer. A brim may need trimming after printing.
For an isolated problem corner, Prusa also suggests adding a small sacrificial geometry nearby. A skirt or draft shield can help retain heat around parts made from higher-warp materials. These slicer options are worth considering before adding surface treatments; glue may require cleanup and can affect how readily a print releases.
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Details are in Prusa’s skirt and brim guide and warping guidance.
Match cooling and enclosure choices to the filament
Plastic contracts as it cools. With higher-temperature materials such as ABS, ASA, and PC, the temperature difference between the hot part and surrounding air can create stress that pulls corners upward. Reduce drafts and keep the ambient temperature stable; consider an enclosure for materials that need one.
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Cooling is not simply a matter of turning the fan off. Prusa advises checking that part cooling is operating for materials such as PLA and PETG. For some small or overhung regions in enclosed, high-temperature prints, low fan levels may help, but too much cooling can lift a print or weaken layer-to-layer bonding. If added cooling is followed by cracking or poor bonding between layers, Prusa suggests raising nozzle temperature enough to restore bonding, within the material’s guidance.
An enclosure is not a universal cure. Prusa says one may be needed for ASA, ABS, PC, PA, PP, and related composites; PLA and PETG generally need more cooling, which can be harder to provide in a warm enclosure. Check your printer’s and filament’s instructions before changing the environment. Prusa explains the material trade-offs in its enclosure guide and warping article.
Use temperature recommendations only within their stated scope
Temperature values belong to specific filament profiles and setups, not to all printers using a material with the same name. For example, Prusa’s ASA guidance lists a 260 °C nozzle temperature and a bed temperature of 105 °C for the first layer and 110 °C for subsequent layers. It also recommends a glue stick on the specified smooth or powder-coated PEI sheets. Treat these as Prusa’s ASA recommendations for the surfaces it names, not universal ASA settings or permission to apply glue to any plate.
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Check the filament and printer maker’s settings before changing temperatures or surface treatments. Prusa’s ASA guide gives the context for its values and plate advice.
Quick Recap
Choose the next fix by symptom and compatibility
| What you observe | What to check or try next | Important constraint |
|---|---|---|
| First lines or skirt fail immediately | Clean and inspect the plate; confirm it is seated; check leveling, first-layer height, extrusion, and the material profile. | Use cleaning products and surface treatments approved for that specific plate. |
| First layer holds, then corners lift | Reduce drafts, stabilize ambient conditions, add a brim, and review cooling and material choice. | Cooling and enclosure needs depend on the filament. |
| A tall or small-footprint model loses grip | Try a brim to enlarge the first-layer contact area. | A brim is easy to test but may need trimming. |
| A high-warp material lifts or cracks | Review enclosure, fan, and nozzle settings against the material guidance. | Too much cooling can cause lifting or poor layer bonding; a warm enclosure may not suit PLA or PETG. |
| Adhesion remains inconsistent after surface checks | Recheck first-layer calibration and the selected printer/filament profile before making gradual changes. | Do not compensate automatically by forcing the nozzle closer. |
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