Elephant's Foot
Correct a widened print base by checking first-layer clearance, bed temperature, and residual first-layer compensation.
Elephant's foot is a lip around the bottom of a print: the first layer or lower layers extend beyond the walls above. It can prevent assembly even when the rest of the part's dimensions are correct.
Establish a good first layer, check bed temperature, then test slicer compensation if a small first-layer lip remains.
Identify the Pattern
| What you see | First check |
|---|---|
| A narrow lip limited to the first layer | First-layer clearance, then compensation |
| Several lower layers bulge but upper walls are correct | First-layer quality and bed temperature |
| Walls and top layers contain excess material throughout | Over-Extrusion |
| Corners lift off the plate | Warping |
| The whole part or its holes are the wrong size | Dimensional Accuracy |
1. Establish a Baseline
- Use dry filament and the matching printer, nozzle, and material profiles.
- Prepare the plate using NPA Application.
- Print a small block with straight walls. Keep orientation, first-layer settings, and thermal conditions consistent between tests.
- After cooling, compare its base width with the width above the affected layers. Measure away from seams or burrs.
- Record whether the lip surrounds the entire part or differs by side or position on the plate.
Save the initial slicer project. Do not tune overall flow solely to remove a lip when the walls above it are correct.
2. Check First-Layer Clearance
Excessively flattened lines with raised ridges indicate that the nozzle may be too close. Lines should join without forming a rippled surface or leaving gaps.
Follow First Layer Calibration. Use small positive Babystepping increments to increase clearance; the guide uses 0.02 mm steps. Inspect the next lines after each small change. Stop increasing clearance if lines separate or lose adhesion.
If the gap remains incorrect or varies across the plate, follow Auto Calibration and its preparation instructions, then the first-layer guide's location-specific checks. Check both heads when the job uses them. After nozzle or heatbreak replacement, complete reassembly and calibration before judging the first layer.
3. Compare Bed Temperature
Once the first layer is correct, compare bed temperature with the printer-specific material profile. If the lower layers remain swollen, test a small reduction within the material's suitable operating range.
Keep nozzle temperature, flow, clearance, and geometry unchanged. Run tests under comparable thermal conditions and measure after cooling.
Reject a lower bed temperature if corners lift or adhesion fails. Follow Warping in that case; a smaller lip is not an improvement when the part no longer stays flat.
4. Test First-Layer Extrusion Width
After correcting Z-offset and bed temperature, a wider first-layer line can help adhesion and line contact. In PrusaSlicer's Advanced or Expert mode, open Print Settings > Advanced > Extrusion width > First layer. Record the current value; do not assume every nozzle profile uses the same width.
With a 0.4 mm nozzle, try 0.5 mm as a comparison if the current first-layer width is smaller. Keep Z-offset, temperature, flow, and Elephant foot compensation unchanged, then re-slice and print the same block. Compare the cooled base width and adhesion. Keep the change only if the first layer remains continuous and the base dimensions improve or remain acceptable.
A wider line is an adhesion adjustment, not a guaranteed correction for elephant's foot. Restore the previous width if the lip or ridges increase. Correct nozzle clearance and bed temperature first; after hotend work, rerun auto-calibration before experimenting with width or compensation.
5. Compensate a Remaining First-Layer Lip
For a small residual lip, find Elephant foot compensation under Print Settings > Advanced in PrusaSlicer's Advanced or Expert mode. It adjusts the first-layer outline rather than correcting several swollen layers or a wrong nozzle gap. See the official Elephant foot compensation documentation.
- Save a profile copy and record its existing compensation value.
- Make a small adjustment, re-slice, and inspect the first-layer preview.
- Print the same block and compare its cooled base width.
- Check narrow features and the printed brim connection as well as the outside edge.
- Reduce compensation if the bottom edge becomes recessed, small features weaken, or the brim no longer connects as intended.
Use the smallest correction that gives an acceptable base. Do not copy another nozzle's value without a test.
Verify the Result
Repeat the representative part with the saved profile. Check base width, flatness, adhesion, and fit near the plate. Confirm that the correction did not create a recessed edge or first-layer gaps.
Keep side and bottom photos, measurements at the base and above it, bed temperatures, Babystepping changes, and compensation values with the slicer project. These observations help diagnose a lip that returns.
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