Corners lifting off the bed? That's warping — and it's fixable. Here's exactly why it happens and how to eliminate it for every material.
1.Add a brim (8–15mm) — most effective single fix
2.Increase bed temp by 5–10°C
3.Turn off part cooling for first 5 layers
4.Clean bed with IPA, apply adhesive (glue stick)
5.ABS/ASA only: add enclosure or draft shield
Warping is a thermal contraction problem. When plastic cools, it shrinks. When the top layers cool faster than the bottom layer (which is still warm from the bed), the top layers pull inward — and since the bottom is constrained by bed adhesion, the corners lift.
The larger the footprint, the more total shrinkage, the more lifting force. This is why warping gets worse on big flat prints and why ABS warps so much — it has a high thermal expansion coefficient (much more shrinkage than PLA or PETG).
| Material | Warp Risk | Enclosure Needed? | Key Fix |
|---|---|---|---|
| PLA | Low | No | Brim + 60°C bed usually enough |
| PETG | Low–Medium | No | Brim + 80°C bed. Watch first layer squish. |
| ABS | Very High | Essential | Enclosure + 110°C bed + ABS slurry + brim |
| ASA | High | Strongly recommended | Same approach as ABS |
| Nylon | High | Recommended | Dry filament + Garolite bed + 90°C bed |
| TPU | Very Low | No | Rarely warps, just slow down first layer |
A brim is a flat ring around your model's footprint. It adds contact area at the edges — exactly where warping starts. This is the single most effective anti-warping measure and has zero downsides (except a few minutes of removal time).
| Brim Width | When to Use |
|---|---|
| 3–5 mm | PLA, small-to-medium prints with low warp risk |
| 8–12 mm | PETG, ABS, large prints, thin tall models |
| 15–20 mm | ABS/ASA large prints, maximum adhesion needed |
ABS and ASA have ~3x the thermal expansion of PLA. Cold ambient air hitting warm layers causes rapid differential contraction. An enclosure traps heat, slowing the cooling rate of all layers uniformly — eliminating the temperature gradient that causes warping.
Target chamber temp: 40–55°C (higher = better for ABS)
DIY enclosure: Cardboard box, IKEA Lack table, or commercial unit (Bambu, Voron)
Ventilation: Run a fan through activated carbon filter — ABS fumes are harmful
For parts where you don't want a full brim, add small discs at corners only — "mouse ears". These anchor the highest-stress corners without adding material everywhere.
Most slicers support this natively: in PrusaSlicer it's called "Wipe Tower" anchors; in Cura you can add them manually as support blockers or use the Brim Only on Corners option.
Bed level and Z-offset calibrated correctly
Bed temperature at material maximum (PLA: 65°C, PETG: 85°C, ABS: 110°C)
Bed surface appropriate for material (PEI for PLA/PETG, Garolite for Nylon)
Bed cleaned with IPA 90%+ before print
Brim added (8mm minimum for large prints)
Part cooling fan off for first 3–5 layers
ABS/ASA: enclosure in use, chamber >40°C
No drafts or aircon pointing at printer
Filament dry (wet filament = poor layer bonding = easier delamination)