How to fix elephant foot on 3D prints

The print is off the plate and the bottom edge is sitting proud of the rest of it, so the part won’t stand flat or won’t go into what it was made for. Before you file anything off, measure it. How far up the flare reaches tells you which of three problems you have, and once the lip is gone, so is the evidence.

Is it actually elephant foot?

Two things get mistaken for it, and both take thirty seconds to rule out.

Brim you haven’t fully removed. A brim is one layer thick and joined to the base, so the collar left after you snap the outer ring off reads exactly like a flared edge. Catch it with a fingernail: brim remnant breaks away in flakes and leaves a clean corner underneath. Elephant foot doesn’t break off, because it is the wall, just wider.

Damage from levering it off a warm plate. Let the plate cool to room temperature before you touch the part, because PLA at bed temperature deforms under a scraper. If the lip is uneven and worst where the scraper went in, that’s you rather than the slicer.

How far up does the bulge go?

This is the bit the slicer documentation skips, and it decides everything else. Drag a fingernail down the side from halfway up, and measure the top as well as the bottom.

What you find	What’s causing it	What actually fixes it
One hard lip at the bottom, a layer high, flat wall above	First layer squish	Elephant foot compensation
A bulge that fades out over the first millimetre or two	Bed heat and the weight above	Bed temperature, or a chamfer
Flared base, and the rest of the part oversize too	Over-extrusion, not elephant foot	Flow calibration

The first two rows are squish versus creep. Squish is mechanical and happens once: the nozzle presses layer one into the plate, that layer comes out wider than you asked for, and layer two onwards prints at its proper width. You get a step, not a slope. Creep is thermal. Most PLA profiles hold the bed at 60°C for the whole print, which is above the 55°C where PLA starts to deform under load, so the bottom few millimetres never properly set while printing continues above them. Warm plastic under load spreads sideways, and because the bed’s heat fades with height, so does the bulge. That taper is the tell.

Taking it off the print you’ve already got

Deburring tool. Drag the swivel head round the bottom edge and the lip comes away as one thin curl. The head straddles the corner and rides on both faces, so it can’t cut deeper than the edge. It is strictly for edges, though — put it flat on a face and it’ll gouge.

Flat needle file on straight runs, held against the side wall rather than the underside, so you take the bulge back to the wall line instead of rounding the corner over. Wet sand after if it’s PLA, for the reason in the guide on getting supports off without marks.

If it’s one layer: the compensation setting

Compensation shrinks the first layer’s outline so that once it spreads, it finishes the size you asked for. Both slicers apply it to layer one and nothing else — I’ve read the slicing code in PrusaSlicer 2.9.6 and Bambu Studio 2.8.2, and both zero the compensation for every layer above the first. Which is why it does nothing for a bulge spanning two millimetres.

• PrusaSlicer 2.9.6: Print Settings, then Advanced, then Elephant foot compensation, in Advanced or Expert mode. Prusa’s vendor profiles ship 0.2mm on the 0.4mm nozzle presets and 0 on the 0.25 and 0.3mm ones, so on a small nozzle it’s off until you turn it on.
• Bambu Studio 2.8.2: Process, then Quality, then Precision, then Elephant foot compensation. The shipped 0.20mm Standard profiles set 0.15mm, apart from the A1 at 0.075mm and the A1 Mini at 0.

For a part that has to fit, measure rather than guess. Print a 25mm cube with no brim and compensation at 0, measure X and Y at the top for reference and at the bottom for the flare, average the two differences, and then halve it. Press lightly, because the first layer squashes under the jaws and reads small, and measure mid-side, not at the corners. Then measure the next print too. Calipers aren’t in our kit, and they aren’t worth buying until you’re printing parts that have to fit each other.

The halving is the step to get right, and it’s the one the calibration pages leave out, Bambu’s own included. Compensation is a per-side offset. Both slicers pull the first layer’s outline inward by that distance the whole way round, so whatever number you type comes off the width twice. Put the full flare in and you take off double, and a value that’s too high is exactly what makes the brim come away from the part on the printed plate.

If it reaches further up: heat and weight

Compensation can’t reach this, so you’re changing the print.

Drop the bed 5°C at a time after the first few layers, leaving the first layer alone. A cooler bed lets the base set sooner and spend less of the print soft enough to creep. The catch is adhesion: you find your limit by losing a print, so move in small steps and keep a brim on.

Chamfer the bottom edge if the model is yours to change. A 0.5mm chamfer at 45° leaves no sharp corner to bulge past, and puts the first layer inboard of the finished edge where its width stops mattering. It’s the only fix here that solves the problem rather than correcting for it, and it’s free.

You turned it on and nothing changed

You’re printing on a raft. Both slicers switch compensation off entirely whenever raft layers isn’t zero. It only ever applies to a first layer printed straight onto the bed, and nothing in the interface tells you that.

You changed build plates. Compensation values don’t carry between plate types, because the squish doesn’t either, so a number measured on a smooth plate is a guess on a textured one.

Full disclosure: I sell a finishing kit with a deburring tool and needle files in it. If your flare is one layer, the setting fixes it and you need neither.