Does Bambu Studio have a fillet or chamfer tool?

No. Bambu Studio can move, scale, rotate, cut, and boolean models, emboss text, simplify meshes, and repair some broken files, but it has no tool that rounds or bevels an edge. That is normal for a slicer; edge geometry is considered modeling work. The workaround is to round the STL before it enters the slicer.

Isn't elephant foot compensation the same thing?

No, and the name trips people up. Elephant foot compensation shrinks the first layers slightly to counter the squish where the print meets the bed. It only affects the bottom face, it works in fractions of a millimeter, and it cannot round the visible edges of the model. Rounding is a change to the model's geometry; compensation is a change to how the first layers are sliced.

Will rounding break my painted multi-color model?

The paint will not survive the trip, and we would rather tell you now. STL files carry geometry only, no color, so exporting a painted 3MF object to STL and rounding it hands you back clean geometry. Round first, then repaint in Bambu Studio. For models where the color comes from separate parts or filament changes by height, nothing is lost.

Will the rounded STL slice differently?

It slices like any other STL, with the same profile, plate, and filament settings you were already using. The only difference you should see is the one you asked for: edges that used to be sharp now carry a smooth radius. The tool will not round a broken or non-manifold mesh; if the model is too damaged to round safely, it says so clearly instead of handing you a bad file.

How to Round STL Edges Before Slicing in Bambu Studio

You have a model on the plate in Bambu Studio, the edges are sharper than you want, and you have been right-clicking around looking for a fillet, bevel, or round-edges option. Save yourself the hunt: it is not there. Bambu Studio does not round edges, and neither do OrcaSlicer, PrusaSlicer, or Cura. This guide explains what the slicer's model tools actually cover, then walks the fastest honest workaround: a round trip through a browser-based edge rounder that takes about a minute and lands the model right back on your plate.

What Bambu Studio's model tools do (and where they stop)

Bambu Studio has a respectable toolbox for a slicer. You can move, scale, and rotate, cut a model in two, subtract shapes with negative parts, emboss text onto a surface, simplify a heavy mesh, and run a repair on some broken files. People reasonably assume edge rounding is in there somewhere.

It is not, and the reason is the same one covered in why STL files are so hard to edit: a mesh has no concept of "an edge" the way CAD does, just triangles. A proper fillet on a mesh means re-sculpting the geometry along the rim, which is modeling work, and slicers deliberately stay out of the modeling business. So the answer to "how do I round edges in Bambu Studio" is honestly "you do it just before Bambu Studio."

Not the same thing: Bambu Studio does have elephant foot compensation in the print settings, and the name makes it sound related. It only shrinks the first layers to counter bed squish. It cannot soften the edges you see and feel on the finished part.

The round trip: out, round, back in

Here is the whole workflow. If your model started life as a downloaded STL, skip straight to step two.

Get the model as an STL. If you downloaded an STL, you already have it. If you have a Bambu Studio project or a MakerWorld 3MF, export the object you want to round as an STL from Bambu Studio first (File, then Export, or right-click the object on the plate).
Round the edges online. Upload the STL to ButterySpace's Round STL tool, pick a radius (0.4 mm just breaks the sharpness, 0.8 mm is the everyday choice, 1.5 to 4 mm is a round-over you can see), and choose which rims to round. By default it does the outer silhouette and through-holes automatically, or you can click a single rim on the 3D preview, or paint just a span of one.
Download the rounded STL. The output is a normal, watertight STL. Embossed lettering and recessed detail survive because the rounding happens at the rims, not across faces. Rounding uses two pats, and you get five free pats a day.
Bring it back into Bambu Studio. Drop the rounded STL into Bambu Studio like any other model, repaint colors if the original was painted, and slice with your usual profile.

Total detour: about a minute, plus however long you spend admiring the corner.

Which radius to pick

Radius	What it gets you
0.4 mm	Breaks the sharp edge. Invisible from a distance, kind to hands.
0.8 mm	The everyday print. Smooth in the hand, still crisp to the eye.
1.5 mm	A round-over you notice. Cases, handles, anything held often.
4.0 mm	Fully softened, almost cushioned. Toys and grips.

If the edge you care about touches the build plate, a small bonus: a rounded bottom edge also gives elephant-foot squish somewhere to hide, so the base looks cleaner without dialing compensation up.

The painted-model caveat, stated plainly

If your model is a multi-color 3MF you painted in Bambu Studio, or a MakerWorld download with paint baked in, know before you start: STL carries geometry only, so the paint does not survive the export and round trip. The honest order of operations is geometry first, color second. Round the edges, bring the STL back, then repaint. If your colors come from filament changes by height or from separate objects per color, you lose nothing.

When the slicer-adjacent route is not enough

The online rounder covers the common case: a finished model whose rims need softening. If you need a true angled chamfer for support-free bottom edges or lead-ins, that is a different cut, covered in how to chamfer an STL file. And if you need to re-sculpt geometry beyond the rims, that is Blender or CAD territory; round STL edges without Blender lays out when the full mesh-editing detour is genuinely worth it.