Clayproof

Blender's mesh tools are built for organic shapes; precise, manufacturable parts fight you at every step. NURBS Forge brings OpenCASCADE — the kernel behind FreeCAD and a number of commercial CAD packages — into Blender as a bundled wheel.

The model is an exact B-rep solid, not a mesh approximation. What you see in the viewport is only a display tessellation, re-derived from the real geometry and stored inside the .blend. That distinction is what makes watertight booleans, true variable-radius fillets and lossless STEP round-tripping possible.

• Delete Face heals the surrounding surfaces, so an imported STEP part becomes editable — remove a supplier's feature, change the shape, put it back.
• Hidden-line drawings export to exact SVG and DXF with visible and hidden layers, arcs kept as arcs and Béziers as Béziers.
• Fillets in four profiles — round, curvature-continuous G2, conic and chordal — plus Full Round, and lofts that meet a body's faces with G1 or G2 continuity.
• Convert to Mesh when the design is done: welded, manifold, exact normals, sharp edges only on creases and UVs at real size. STEP and IGES keep real-world units in both directions.
• Class-A inspection: curvature combs, surface-curvature false colour and zebra striping.

Run Auto Retopo on a sculpt, a 3D scan or an AI-generated mesh and get a clean all-quad base. Then select just the region that matters — an eye, a mouth, a limb, a joint, a crease — and rebuild only that, with the topology an artist would lay by hand, stitched back in with zero T-junctions. Everything else stays untouched.

The retopology engine is written in Rust and ships inside the extension. No Python packages, no external binaries, no setup step.

• Region Retopo — eye and mouth rings with a chosen rim edge count, limb loops, joint accordions, crease rows, flat grids. Suggest reads the selection's shape and proposes the right one.
• Exact bilateral symmetry that welds the centre seam, with none of QuadriFlow's seam holes.
• Surface-checked rebuilds. Every region rebuild is measured against the mesh it replaces. A result that would delete or double-cover part of the surface is refused and the model is left as it was; an Allow surface loss toggle overrides it for a deliberately coarser pass.
• Optional local AI assist through a model on your own machine. Nothing leaves the computer, and a guard measures every patch and reverts anything that does not improve the mesh.

Hard-surface sculpting in Blender means fighting the brushes. Everything is tuned for clay, cuts are a trip to Edit Mode, and greebles are a second add-on.

This one cuts like a vector tool: draw a Bézier path on the surface with 0/45/90° guides and a live angle readout, then cut straight through. An open path is a guillotine blade; a closed shape is a cookie cutter. Every boolean seam gets a Sharp, Chamfer or Round edge applied only to the cut, never to the rest of the model.

• 36 procedural kit parts — bolts, grilles, heatsinks, hatches, turbines, cables — generated on the spot, so they stay crisp at any size with nothing to install.
• Face Sets by Angle and Panel Loops turn a blockout into armour plating with gaps and thickness in two clicks.
• Pure Python. No wheels, no binaries, no network access — the only one of the three that runs on Windows, macOS and Linux alike.