#Fillet

Key F. Click edges — or a whole face, then all of its edges are taken. The radius is set at the geometry, Enter applies.

#A fillet holds on to the edge, not to a number

Change the extrusion height or move a wall — the fillet stays on the same edge. A change higher up the history does not knock it off.

#If it fails

The usual reason is a radius larger than the geometry allows: the neighbouring face is shorter than the radius, or two fillets met and ate each other. In that case the program does not say “it failed” — it breaks the answer down per edge: which one takes no radius at all, which one takes no more than a given value.

Read that breakdown — it is the instruction on what to fix: reduce the radius, drop one of the edges, or move the fillet earlier in the timeline.

#Order matters

A fillet placed before a cut and the same fillet after it are different shapes. Usually fillets go last, once the main shape is there.

#See also

• Chamfer — the same edge, cut flat.
• The history timeline and rollback — why fillets come last.