How to Fix PETG Elephant Foot
Elephant foot — the flared, bulging first millimetres of a print — hits PETG harder than PLA for a simple reason: PETG runs its bed 15–25 °C hotter, so the base of the part stays soft under the weight and pressure of everything printed above it.
Why PETG feet flare
Two forces make any elephant foot: the first layer is deliberately squished for adhesion, and the warm base layers ooze outward under load before they set. PETG’s numbers stack the second force: the stock bed runs 70 °C on textured PEI — comfortably above PETG’s 60 °C softening point — so the bottom millimetre stays rubbery for the whole print. Some flare is thus designed in with PETG; the goal is controlling it, not zeroing it.
Fixes in order
1. Use elephant-foot compensation. The slicer shrinks the first layers inward to pre-pay the bulge. Bambu’s stock X2D process profile ships with 0.15 mm of compensation; if your bottom edge still flares, raise it to 0.2–0.3 mm. Vendors ship different starting points — Anycubic’s baseline uses 0.2 mm, Elegoo’s 0.1 mm, and Prusa’s profile relies on its own first-layer handling instead — so check what your profile already does before doubling it.
2. Trim the first-layer bed temperature. Adhesion needs the heat most on layer one; afterwards you can afford less. Keep the first-layer bed at stock and drop the “other layers” bed temperature 5 °C toward 65–70. Don’t go further down for elephant foot alone — PETG’s grip fades fast with bed temperature, and a mid-print release costs more than a flared edge.
3. Check the squish. A first layer pressed too hard flares mechanically regardless of temperature. If the whole first layer looks ploughed and translucent, re-run bed leveling / recalibrate z-offset; PETG wants a gentler squish than PLA anyway (see the PETG first layer guide).
The CAD-side fix that beats them all
Add a small chamfer — 0.4–0.6 mm at 45° — to the bottom edge of parts you design. The chamfer swallows the bulge geometrically: the flare expands into space the part never claimed, and mating parts, lids and sliding fits assemble without post-processing. Once you start chamfering bottom edges you never stop; it is free insurance on every material, not just PETG.
When the foot means something else
- Flare plus rounded, droopy lower walls on a hot summer print can be early heat sag, not classic elephant foot — improve airflow around the base or drop the bed 5 °C.
- Flare on one side only is a leveling/first-layer squish asymmetry — the compensation setting can’t fix a tilted plate.
- A fat first layer that peels is under-adhesion wearing a costume; work through PETG bed adhesion first, because compensation on a loose base makes release more likely.
The material-agnostic treatment — measuring the bulge, dimensional tolerance strategies, when to use a raft instead — is in the elephant foot guide; PETG’s full profile values in the PETG settings guide.
Frequently asked questions
Why does PETG get elephant foot worse than PLA?
Because PETG runs its bed 15–25 °C hotter. The stock bed is 70 °C on textured PEI — comfortably above PETG's 60 °C softening point — so the bottom millimetre stays rubbery for the whole print and oozes outward under the weight of everything above. Combined with the deliberately squished first layer, some flare is designed in with PETG; the goal is controlling it, not zeroing it.
How much elephant foot compensation should I use for PETG?
Bambu's stock X2D process profile ships with 0.15 mm of compensation; if your bottom edge still flares, raise it to 0.2–0.3 mm under Process → Quality. Vendors ship different starting points — Anycubic 0.2 mm, Elegoo 0.1 mm, Prusa relies on its own first-layer handling — so check what your profile already does. You can also drop the other-layers bed temperature 5 °C toward 65–70 °C while keeping layer one at stock.
Should I chamfer the bottom edge of parts instead of tuning settings?
Yes, when you design the part yourself — a small 0.4–0.6 mm chamfer at 45° on the bottom edge beats every slicer fix. The chamfer swallows the bulge geometrically: the flare expands into space the part never claimed, so mating parts, lids and sliding fits assemble without post-processing. It's free insurance on every material, not just PETG.
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- Elephant Foot: Causes and Solutions — Bambu Lab Wiki
- OrcaSlicer vendor profiles — SoftFever/OrcaSlicer (GitHub)