STL Solid

STL Solid Tool

Convert hollow or multi-part STL files into solid objects by detecting and keeping only the outer manifold surface. Perfect for cleaning up complex imported meshes and removing internal artifacts.

Make STL File Solid

Upload an STL file to detect and keep only the outermost manifold surface, removing internal geometry and artifacts.

Drop STL files here or click to browse

Supports ASCII and Binary STL formats

Outer Surface Detection

Automatically identifies and preserves the outermost manifold surface while removing all internal geometry.

Manifold Analysis

Uses manifold-3d decomposition to analyze connected components and select the largest outer boundary.

Artifact Removal

Perfect for cleaning up imported CAD meshes, removing floating geometry, and internal artifacts.

About STL Solid Tool and Manifold Surface Detection

STL solidification uses advanced manifold decomposition algorithms to identify and extract the outermost surface from complex 3D models. Our tool employs manifold-3d technology for professional-grade geometric analysis and surface extraction.

When to Use STL Solidification:

  • CAD Import Cleanup: Remove internal artifacts from imported meshes
  • Hollow Model Conversion: Convert hollow models to solid for better printability
  • Multi-Part Consolidation: Extract main body from models with floating components
  • Mesh Repair: Clean up corrupted or complex geometry with internal issues

Advanced Solid Processing Features:

  • Component Analysis: Automatic decomposition of connected manifold components
  • Volume Detection: Identifies largest component by bounding box volume
  • Surface Extraction: Preserves outer surface topology while removing internals
  • Statistics Tracking: Real-time reporting of removed components and geometry

Technical Implementation:

  • Manifold-3d Engine: Industry-standard WebAssembly manifold operations
  • Decomposition Algorithm: Separates connected components for individual analysis
  • Boundary Detection: Automatic identification of exterior manifold surfaces
  • Geometry Validation: Ensures resulting mesh maintains valid topology