---
title: Rounding & Blending
order: 5
---

Chisel uses the same five-profile system everywhere fillets exist — primitive edge rounding, boolean blends, mirror seams, array seams, prism bevels, emboss inner corners. Pick the profile, set the radius, done.

## What's the difference?

**Rounding** is the radius applied to the edges of a *single primitive*. Set it on the primitive and every applicable edge softens.

**Blending** is the radius applied at the *seam where two shapes meet* — booleans, mirrors, arrays, emboss/engrave. Set it on the modifier and the join becomes a smooth fillet.

Both use the same five profiles and the same numeric range. The only difference is whether they live on the primitive or on the modifier.

## Topics

- **[Profiles](profiles.md)** — the five fillet shapes (Round / Sharp / Soft / Tight / Chamfer) explained
- **[Rounding](rounding.md)** — primitive edge rounding workflows and parameters
- **[Blending](blending.md)** — modifier-seam blending across booleans, mirrors, arrays

## Where each setting lives

| Surface | Setting |
|---|---|
| Primitive edges | Object Properties → Chisel → *Rounding* + *Profile* |
| Boolean seam | Modifier panel → Boolean → *Blend Radius* + *Blend Profile* |
| Mirror plane | Modifier panel → Mirror → *Mirror Blend* |
| Array seam | Modifier panel → Array → *Smooth* |
| Emboss outer seam | Modifier panel → Emboss → *Blend Radius* + *Profile* |
| Emboss inner corner | Modifier panel → Emboss → *Inner Radius* + *Inner Profile* |
| Prism vertical edges | Object Properties → Chisel → *Bevel* + *Bevel Profile* |
| Trapezoid corner edges | Object Properties → Chisel → *Bevel* + *Bevel Profile* |