Blender best practices, Python code snippets, and design-for-3D-printing rules for the Blender MCP server. Use when creating 3D models, manipulating geometry, applying materials, or performing operations like bisecting, boolean operations, and mesh editing. Also use when designing printable parts — covers orientation, edge treatment, hole design, fit features, support avoidance, and dimensional tolerances for FDM/FFF printing. Contains working bpy code patterns discovered through iteration.