Identify the affected region
Elephant foot is a lip around the base, not a uniform size error through the whole part. Set the cooled object on a flat surface and inspect the lowest edge under side lighting. Compare the base with a wall several layers higher. If both regions are oversized, investigate overall dimensional accuracy rather than correcting only the first layer. A brim still attached to the object can also look like a lip; remove it before judging the part.
Separate clearance from heat
Inspect a one-layer patch using the same plate and filament. Deep ridges, scraping, or material pushed beside each line suggest excessive compression. Correct the first-layer setup through the printer’s documented calibration rather than hiding it with a geometry adjustment. If the patch is continuous and smooth but the base remains swollen across several layers, compare the bed setting with the material profile. Do not reduce temperature until adhesion fails just to make a single measurement look better.
Use compensation carefully
First-layer compensation contracts the sliced footprint; it does not repair the printer mechanically. Save an unchanged profile before testing it. Inspect small holes, thin feet, and the brim connection in preview. A correction that improves a large block may remove too much contact area from a narrow clip. Check whether the model already includes a bottom chamfer, because applying both adjustments can leave an unintended recess.
Run a fitting test
Use a small sample containing the same bottom edge and mating feature as the final part. Compare an unchanged sample with one compensated sample after both have cooled. Record base width, upper wall width, and actual fit. Choose the smallest correction that removes interference while retaining adhesion. If several bottom layers are affected, a first-layer-only correction has reached its limit; return to the thermal and clearance checks.
Distinguish the lip from three look-alike problems
| Finding on the cooled part | Why the distinction matters |
|---|---|
| A narrow lip at the bottom, with upper walls near the intended size | First-layer behavior and compensation are relevant. |
| Similar oversize at the base and upper wall | Investigate a broader dimensional or geometry issue. |
| A separate attached brim around the footprint | Remove the intended adhesion feature before measuring. |
| A lifted corner instead of a wider base | Diagnose warping, not footprint contraction. |
Compare like-for-like measurement locations and avoid pressing a flexible part out of shape with a measuring tool. A top-down photo can make a lip visible but cannot establish a reliable dimensional correction by itself.
A hypothetical fitting example
Imagine a small box that catches at its bottom edge when inserted into a sleeve, while its upper walls fit. Print a short section containing the real bottom edge and sleeve clearance. Compare the baseline with one supported compensation change, using the same material, orientation, and reference profile. Let both samples cool before assessing fit.
If the lip decreases but a narrow foot detaches during printing, the compensation has traded fit for contact area. Return to the previous setting and revisit the first layer or model design. If upper walls still bind, stop increasing first-layer compensation: the evidence does not isolate the base anymore. This is an example of experimental design, not a case study tested by PrintFix3D.
Do not copy a compensation value between slicers
Check whether compensation is already active in the profile and how the slicer applies it to thin features. The linked Prusa documentation describes its implementation; that is not a Bambu Studio setting specification. Inspect the sliced first-layer contour after every change and preserve the unmodified project for comparison.
A designed bottom chamfer can be another way to manage a mating edge, but it changes the model and should be evaluated separately. Neither approach repairs scraping, contamination, or a loose plate. Use the first-layer test to establish a sound baseline before choosing a geometry correction.
Measurement record
| Check | Evidence to keep |
|---|---|
| Base versus upper wall | Measure both regions after cooling; a global size error is a different diagnosis. |
| Compensation | Record the original and trial values, plus whether a chamfer already exists. |
| Fit and contact | Check the mating feature, narrow feet, and brim connection. |
Reference and limits
Prusa documents contraction of the first-layer footprint in its compensation guide. Use your slicer’s own implementation and inspect its preview; a value from that page is not a universal correction. The fitting example is hypothetical and has not been physically tested by PrintFix3D.