Model-Based Definition (MBD) in 3D CAD Software

Unlike traditional CAD tools that treat MBD as an afterthought or paid add-on, Onshape is integrating MBD directly into the core modeling experience. Because Onshape is already a cloud-native platform with a built-in viewer, MBD annotations are seamlessly part of the design, not a separate or clunky bolt-on.

PMI is the manufacturing data added to a 3D model, like dimensions and tolerances. MBD is the practice of using that 3D model, with PMI as the full product definition, replacing or automating 2D drawings.

Onshape MBD is available to all Onshape users. We’re making this capability universal because it’s an essential documentation tool, deeply integrated into core sketching and modeling workflows.

Yes. MBD supports default tolerance definitions. Companies can configure standard tolerances and deploy them through element libraries, automating upper and lower limits that QA typically manages.

Onshape delivers true cloud-native model-based definition, embedding PMI directly in the 3D model, while SOLIDWORKS, Fusion, and Inventor often rely more heavily on file-based workflows or add-ons. This makes collaboration, version control, and reuse of MBD data simpler and more consistent in Onshape.

While many systems support tolerance and feature customization, only Onshape integrates this directly into the core modeling experience, allowing you to capture it as you design rather than adding it later.

Onshape MBD is best for fast-moving, highly collaborative industries such as automotive, industrial equipment, robotics, and consumer products. These industries benefit most from MBD efficiency gains.

By integrating CAM (Computer-Aided Manufacturing) and providing a single source of truth, model-based definition manufacturing reduces interpretation errors and rework. Manufacturers can program, simulate, and machine parts directly from annotated 3D models without waiting for finalized drawings.

In many cases, 2D CAD drawings are no longer mandatory, especially when sharing STEP files or native 3D CAD models with embedded PMI. However, some customers or regulatory requirements may still request 2D deliverables.

Yes, most suppliers can consume MBD data in neutral formats such as STEP. This allows them to view geometry, PMI, and tolerances without needing the original CAD system.

MBD enables inspection teams to drive CMM (Coordinate Measuring Machines) directly from the annotated model while also defining the full upper and lower limits of every requirement, not just nominal dimensions. By embedding tolerances and default tolerance rules in the model, MBD eliminates manual transcription of limits and automatically establishes clear pass/fail criteria, significantly streamlining FAI (First Article Inspection) and downstream quality automation.

Onshape’s MBD workflows align with established standards such as ASME Y14.41 and ISO 16792, which define best practices for digital product definition. These standards ensure MBD data is structured, interpretable, and manufacturing-ready across downstream systems.