How is the warp score calculated?

Each input contributes weighted points to a risk total that is normalised to 0 to 100%. Material is the largest weight (ABS and Nylon score high, PLA low), followed by part footprint, then bed surface, enclosure use, layer height, and ambient temperature. The weights reflect how much each factor drives differential contraction in practice.

Why is material the biggest factor?

Warping is driven by how much a polymer contracts as it cools below its glass transition. ABS and Nylon shrink sharply and have high glass transitions, so they warp readily. PLA and PETG shrink little and stay dimensionally stable, so even large parts rarely lift.

Does part footprint matter more than height?

For warping, yes. A long flat base accumulates more total contraction, pulling the corners up. Tall thin parts warp less at the base but can suffer layer splitting higher up. This tool scores footprint heavily and treats large flat bases as the main risk.

Will an enclosure always fix warping?

It is the single most effective mitigation for ABS, ASA, and PC because it keeps the whole part near its glass transition while printing. But an enclosure plus a poor first layer or a cold draft can still warp. The tool credits an enclosure but does not zero the risk on its own.

What are the top mitigations?

In rough order of impact: use an enclosure for warp-prone materials, maximise first-layer adhesion (brim, clean bed, correct Z-offset), keep the room draft-free, switch to a lower-warp material where possible, and add mouse-ears or a brim on sharp corners.

Warping Risk Assessor

This tool estimates how likely a print is to warp and tells you which factor is hurting you most. Warping comes from differential contraction: as hot plastic cools it shrinks, and an uneven shrink pulls corners off the bed. The score weights the inputs that drive that effect.

How it works

Each input adds weighted points to a risk total, normalised to a 0 to 100% score:

Material (largest weight): ABS and Nylon are high-warp, ASA and PC moderate-high, PETG low, PLA lowest.
Footprint: larger flat bases accumulate more contraction and score higher.
Bed surface: textured/PEI grips well (lower risk); bare glass without adhesive scores higher.
Enclosure: a sealed, warm chamber is the strongest single mitigation and subtracts risk.
Layer height: thicker layers cool with more stored stress, a small upward factor.
Ambient temperature: a cold room cools parts faster and unevenly, raising risk.

The result maps to a band: Low (0-29%), Moderate (30-59%), High (60-100%), each with targeted mitigation advice.

Worked example

ABS, 200mm footprint, glass bed, 0.28mm layers, no enclosure, 19C room:

High-warp material + large footprint + no enclosure + cold-ish room stack up to a High score (roughly 80%+).
Top mitigation: add an enclosure and use a brim with a clean, properly trammed bed.

Switch the same job to PLA on textured PEI and the score drops into the Low band — PLA’s tiny contraction dominates the result.

Tips and notes

The score is a relative guide, not a guarantee. Even a high score can print fine with a brim and clean bed; a low score can still warp with a draft or greasy bed.
Mouse-ears (small disc tabs at corners) cheaply rescue sharp-cornered ABS parts.
Keep filament dry — wet Nylon and PETG print poorly and adhere worse, compounding warp.
First-layer adhesion is the foundation; pair this with a first-layer width/height check.

All scoring runs locally in your browser.