HOW TO FIX 3D PRINT WARPING

Warping occurs when the edges or corners of a 3D print curl upward and detach from the build plate. In severe cases the entire print can pop off the bed mid-print. It's especially common with ABS and nylon, but can happen with any filament.

Warping is caused by uneven cooling and thermal contraction: • Bed temperature too low — The bottom layers cool and shrink while upper layers are still being printed, creating stress that pulls corners up. • No heated bed or poor bed adhesion — The print can't grip the surface well enough to resist contraction forces. • Cooling fan too aggressive — Rapid cooling on lower layers increases the temperature differential. • Room drafts — Cold air hitting one side of the print causes uneven contraction. • Large flat prints — More surface area means more contraction force. • First layer too fast or too high — Poor first layer adhesion is the root of most warping.

First, make sure your bed is properly leveled and your first layer is squished — it should look slightly flat, not round. Increase bed temperature: 60°C for PLA, 80°C for PETG, 100–110°C for ABS. Add a brim (8–15 lines) in your slicer. This extends the first layer outward, giving it a much larger grip area. For large prints, use a raft instead. Apply adhesion aids: glue stick (PVA) works for most filaments. Hairspray works well on glass beds. Clean your bed with IPA before every print. Reduce or disable the part cooling fan for the first 3–5 layers. Set first layer speed to 20–25 mm/s for better adhesion. For ABS, nylon, or ASA: use an enclosure. Even a cardboard box draped over the printer helps retain heat and prevent drafts.

Always clean your bed with isopropyl alcohol before printing. Use a PEI sheet for great adhesion with most filaments. Print a brim by default for any part larger than 50 mm. Keep your printer away from windows, doors, and AC vents.