Elephant's foot: the base of the part is wider than the layers above

How to recognise it

Elephant's foot is a protruding rim at the base of the part: the first layer, and sometimes the first few layers, are wider than those above. Bambu Lab explains it with two simultaneous effects: heat from the bed keeps the first layer soft and the weight of the following layers squeezes it outwards. The defect is more visible on large parts and wide bases.

On a decorative part, a slight elephant's foot can be ignored. It becomes a problem on parts with tight tolerances, such as joints, clips, rails and shaft holes: the flared base makes the fit stiff or impossible. It should not be confused with warping, where the corners lift off the bed, or with an uneven first layer.

The most common causes

A first layer squished against the bed is normal and needed for adhesion, so a small flare is almost always present: that is why slicers offer compensation. The defect gets worse if the nozzle is too close to the bed (Z offset too low or bed not level), if the first layer is over-extruded or if the bed is too hot and keeps the base soft for longer.

The profile matters too: in a thread on the Bambu Lab forum, some A1 mini users noticed that after a profile update the compensation had been reduced or set to zero in some presets, and parts that used to fit had become too tight at the base. If the defect appears suddenly, check the compensation value in the profile you are using.

Checks to do, in order

Check one thing at a time, printing the same test piece without a brim after each change.

1. Clean the bed and run the levelling procedure for your printer, then check the first layer: if the lines are very flat and shiny, the nozzle is too close. See the first layer guide.
2. Check the elephant's foot compensation: in PrusaSlicer it is in Print settings → Advanced (Advanced or Expert mode), in Bambu Studio in Process → Quality → Precision. Prusa gives about 0.2 mm for a 0.4 mm nozzle.
3. For precision parts, calculate the value as Bambu Lab describes: print a cube, for example 25 × 25 × 10 mm, with compensation at 0 and no brim; wait for the bed to return to room temperature; measure the base and the top with a caliper at the middle of each side; use the average of the X and Y differences as the compensation.
4. If the first layer is over-extruded, calibrate the flow and check that the nozzle is not worn.
5. Try lowering the bed temperature in 5 °C steps, staying within the values given for the material and checking that adhesion remains good.
6. If the defect remains, add a 45° chamfer to the bottom edge in the model: the squished material fills the chamfer instead of sticking out.

Notes from manufacturer documentation

Prusa: compensation shrinks the first layer to offset the squish and is enabled by default in the official profiles. Since PrusaSlicer 2.2 the slicer detects thin lines in the first layer so it does not shrink them too much. With compensation enabled, the brim may not touch the model in the preview and may be less firmly attached: this is expected, but if it does not connect at all the value is probably too high.

Bambu Lab: for models without precision requirements the default value is fine; for assemblies and snap fits it suggests measuring the defect on a test piece. The value differs between build plate types and must be recalculated when you change plates. Here too the brim may look detached in the preview: during printing the gap is usually filled by the squished material.

Anycubic: it lists an unlevelled bed, a nozzle too close to the bed, a bed that is too hot and first-layer over-extrusion among the causes. For bed temperatures it gives about 55–65 °C for PLA and TPU and 100–110 °C for ABS, and suggests a raft or a 45° chamfer when other fixes are not enough.

What users report in the forums

In the Bambu Lab forum thread about the A1 mini, users report different compensation values between presets and Bambu Studio versions, with no definitive official fix. One user solved the problem by recalibrating the filament flow, which turned out to be far off; others created a custom profile with higher compensation. In the comments on Prusa's page, some users report that lowering the nozzle temperature by 5–10 °C reduced the defect more than increasing the compensation. These are individual experiences, not official guidance.

When replacing a part is justified

Almost never: elephant's foot is corrected with levelling, the first layer and slicer settings. Replace the nozzle only if it is so worn that it causes over-extrusion or uneven flow. A new build plate does not fix the defect on its own and, according to Bambu Lab, means recalculating the compensation.

How to verify the result

Record the model and variant, material, slicer profile and change made. Repeat the same test and compare the result with a photo taken before the adjustment. Keep the change only if it improves the defect without introducing others. Use your model’s instructions for temperatures, calibration and disassembly; this guide is not based on our own hands-on tests.