Fillet / chamfer edges

Round or bevel individual edges.

The edge tool rounds (fillet) or bevels (chamfer) specific edges you pick, rather than a whole solid — for finishing selected corners. Every edge starts at 2 mm; the size, fillet or chamfer, and the smoothness are all set in the Properties panel afterwards. To change one later, select its row in the Scene panel, named for what it does and how many edges it treats — “Fillet — 3 edges”, say.

Connected follows the edge you click on along the outline: round every curve, and through each corner up to the Max turn set beside it. At the default 50° it stops at square corners; at 90° or more one click takes a whole squared outline, like the rim of a pocket. At a corner it stays in the outline’s plane rather than turning onto an edge that runs up or down a wall. Single takes one edge only — one straight side, or one curve — so a rounded corner can be treated apart from the sides it joins.

The tool stays open after a click. Until you click another edge or press Done, changing Connected, Single or the Max turn re-picks the fillet you just made, starting from the same edge — so you can try a setting and see it on the model. Fillet and Chamfer there switch it too, just as they do in the Properties panel, and its name follows (“Chamfer — 1 edge”). A new click makes a new fillet.

An inside corner works too: pick the edge at the bottom of a valley where two faces meet and the fillet fills it with a smooth cove — the way to smooth out a joint. To soften every inside corner of a part at once, use Round edges with Edges set to Inner.

1. Activate the Fillet edge tool, and in its banner choose how much a click takes: Connected or Single.
2. Click the edge to treat — a 2 mm fillet goes on straight away and the Properties panel opens on it.
3. Set the size in Edge size, or switch Edge to Chamfer for a bevel.