Convert STL to SLDASM

Understanding STL and SLDASM file formats

STL (Stereolithography) is a widely used file format for 3D printing and computer-aided design (CAD) that represents the surface geometry of a 3D object using triangles. It does not contain color, texture, or other CAD-specific data such as features or assembly information.

SLDASM is the assembly file format used by SolidWorks, a popular CAD software. SLDASM files store information about how multiple parts (SLDPRT files) are assembled together, including constraints, relationships, and references between components.

Why convert STL to SLDASM?

Converting an STL file to SLDASM is often necessary when you want to use a 3D model (originally intended for 3D printing or sharing) as part of a larger assembly in SolidWorks. However, STL files are mesh-based and lack the parametric and feature data required for full CAD editing, so the conversion process involves importing the mesh and reconstructing or referencing it within an assembly.

How to convert STL to SLDASM

Direct conversion from STL to SLDASM is not straightforward because STL files do not contain assembly or part feature data. The typical workflow involves:

1. Importing the STL file into SolidWorks as a part (SLDPRT).
2. Optionally converting the mesh to a solid body using SolidWorks' Import Diagnostics and FeatureWorks tools.
3. Creating a new assembly (SLDASM) and inserting the imported part(s).
4. Saving the assembly as an SLDASM file.

Step-by-step conversion using SolidWorks

1. Open SolidWorks and go to File → Open. Select your STL file and set the file type to STL.
2. In the import options, choose to import as a Solid Body (if available) or as a Graphics Body.
3. Use Insert → Features → Convert to Solid or Import Diagnostics to repair and convert the mesh if needed.
4. Save the imported part as an SLDPRT file.
5. Create a new assembly via File → New → Assembly.
6. Insert the SLDPRT file into the assembly.
7. Save the assembly as an SLDASM file via File → Save As.

Recommended software for STL to SLDASM conversion

• SolidWorks – The best and most reliable tool for this conversion, as it natively supports both STL import and SLDASM creation.
• Autodesk Fusion 360 – Can import STL files and export to SolidWorks formats, but may require additional steps.
• FreeCAD – Can import STL and export to STEP, which can then be imported into SolidWorks for assembly creation.

For the most accurate and feature-rich conversion, SolidWorks is highly recommended.