Elephant foot is the outward bulge at the bottom of a print, where the first few layers spread wider than the layers above. It happens when a hot bed and a hard first-layer squish push soft plastic outward. Per Bambu’s print-quality catalogue, the fix is a cooler bed, a touch more Z-offset, and the slicer’s own compensation.
The bulge is cosmetic on a rough part, but it ruins a tight fit or a part that mates with another. Work the causes in order and reprint the same model after each change.
Any material can bulge, but PLA and PETG show it most on a hot bed, because they stay soft longer at the base.
The causes, ranked
| Likely cause | Fix | Severity |
|---|---|---|
| Bed too hot | Drop the bed temperature 5 to 10 C so the first layers stiffen faster. | hi |
| First layer squished too hard | Raise the Z-offset a little so the first layer is not pressed flat. | hi |
| Nozzle too hot | Lower the nozzle 5 C so the filament sets quicker at the base. | md |
| No elephant-foot compensation | Turn on the slicer compensation to taper the bottom layers inward. | md |
| First-layer flow too high | Ease the first-layer flow a few percent so less plastic spreads out. | lo |
Start with these fixes
Print a small calibration cube and measure the base, then work top to bottom and reprint after each step.
Drop the bed temp
Lower the bed 5 to 10 C and reprint. The first layers stiffen before they bulge.
Raise the Z-offset
Add a small amount to the Z-offset so the first layer is not mashed flat.
Turn on compensation
Enable elephant-foot compensation in the slicer to taper the bottom layers inward.
Ease first-layer flow
Cut the first-layer flow by a few percent and reprint.
Deeper fixes when the quick ones fall short
When the bed and the Z-offset do not end the bulge, the layer setup and the level are the next place to look.
Set the first-layer height
Use about 0.2 mm or the height your printer profiles well, so the first layer bonds without spreading.
Try a lower first-layer nozzle temp
Some slicers let you print the first layer cooler and rise after, which stiffens the base.
Check the bed level
An unlevel bed squishes one corner harder, so the bulge shows on one side.
How your filament matters
PLA and PETG bulge the most, because they stay soft on a hot bed and spread under the print’s weight. ABS and ASA hold their shape a little better but want a hotter bed and an enclosure. Any material bulges if the first layer is squished too hard.
Mistakes that hide the cause
A few common habits trade the bulge for a worse problem.
Avoiddo not
- Dropping the bed so far the first layer stops sticking.
- Raising the Z-offset too much and losing first-layer adhesion.
- Leaving compensation on for every print, even tall parts that do not bulge.
- Changing bed temp, Z-offset, and flow in one pass, so the real cause stays hidden.
Key takeaways
- Elephant foot bulges the bottom layers from a hot bed and a hard first-layer squish.
- Drop the bed 5 to 10 C and raise the Z-offset a touch first.
- Turn on the slicer compensation as a clean fix.
- Change one setting and reprint the same model.
For related topics, the first-layer adhesion guide covers the opposite problem, and the filament storage guide covers keeping spools dry.
Related guides
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Sources & methodology
2 citations · reviewed 2026-07-10- 01Bambu Lab Wiki: Common print quality problems (elephant foot, extrusion)accessed 2026-07-09Tier 1
- 02All3DP: Elephant's foot causes and fixesaccessed 2026-07-09Tier 2