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Build Multi-Part Assemblies from Scratch

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This tutorial demonstrates how to create an assembly programmatically using parts and instances, then export it as a structured STEP file.

Parts, Instances, and Nodes​

An assembly document organizes your 3D model into a hierarchy:

  • Parts are the unique component designs (e.g., a wheel, a door, an engine)
  • Instances are the actual placements of those parts in your model (e.g., "put a wheel at each corner of the chassis")
  • Assembly nodes are containers that group related instances together (e.g., "the drivetrain" containing engine and transmission)

Why Create an Assembly?​

You can simply export flat BRep shapes to STEP files, but it's worth creating an assembly before you hit that export button. Here's why:

1. Preserved Structure in CAD Software​

When you open the exported STEP file in professional CAD software like FreeCAD, Fusion 360, SolidWorks, CATIA, or Onshape, you'll see:

  • Each part listed separately in the model tree
  • Individual instances that can be selected, modified, or replaced
  • The full hierarchy of your assembly

2. Efficient File Size​

When you have multiple copies of the same shape (like the 14 plugs in our example), the assembly stores the geometry once and references it multiple times with different transformations. This makes files smaller and faster to load.

3. Part Metadata​

Each part and instance can have:

  • A unique ID for programmatic access
  • A human-readable name that appears in CAD software
  • Colors that are preserved in the STEP export
  • Author and organization information embedded in the file

4. Professional Workflow Compatibility​

STEP files with assembly structure are the industry standard for exchanging CAD data between different software packages. Your colleagues using different CAD tools can open and work with your designs seamlessly.

STEP File Format​

The STEP (Standard for the Exchange of Product Data) format is an ISO standard (ISO 10303) widely supported by virtually all CAD software. When you export with the .stpZ extension, the file is compressed for faster downloads and smaller storage.

Example: Base with Plugs Assembly​

In the example below, we create an assembly with:

  • A base part with holes arranged in a circle
  • A plug part that fits into the holes
  • 14 instances of the plug positioned around the base

After running the script, download the generated .stpZ file and open it in your favorite CAD software to see the full assembly structure!

Bitbybit Platform

Creating STEP OCCT Assembly

rete logoRete
Script Source (rete)
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