I’d like to start a discussion about CAD data reuse strategies versus duplication, particularly in the context of formula and variant management. Our organization is debating whether to reuse base CAD models across product families or duplicate them for each variant.
The reuse approach means maintaining a single master CAD model with formula-driven variations, which theoretically reduces storage and ensures consistency. However, it creates complex dependencies and makes change management more difficult when one product line needs modifications that shouldn’t affect others.
The duplication approach gives each product line independent CAD models, simplifying change control and version management, but increases storage requirements and risks divergence over time. We’ve seen both strategies succeed and fail in different organizations.
What are your experiences with data reuse versus duplication? How do you balance version control complexity against data integrity concerns? Are there specific scenarios where one approach clearly wins over the other?
Change management impact is where reuse becomes really challenging. When you have shared CAD models, every engineering change requires cross-product impact assessment. Our change process takes 40% longer for reused components because we have to validate all affected configurations. We’ve started using a hybrid approach: reuse for stable, mature components that rarely change, and duplicate for components still under active development or with high change frequency. This balances the benefits of both strategies.
From a designer’s perspective, duplication is far easier to work with day-to-day. When I need to modify a part for a specific product, I don’t want to worry about breaking configurations for three other products. The mental overhead of tracking formula dependencies is significant. Yes, storage is cheap, but engineering time isn’t. We duplicate base designs and use Windchill’s ‘derived from’ relationships to maintain traceability to the original.
We’ve gone through this exact debate. Our conclusion was that it depends heavily on the product lifecycle and commonality percentage. If variants share more than 70% common components, reuse with formula management works well. Below that threshold, the complexity of managing conditional variations outweighs the storage savings. We use reuse for platform components and duplication for product-specific assemblies.
The version control aspect is critical and often underestimated. With reuse, a single version change affects multiple product configurations simultaneously, which can be beneficial for consistency but dangerous for stability. We’ve had situations where a formula update intended for Product A inadvertently changed dimensions in Product B that was already in production. Now we use strict change impact analysis tools before any modifications to shared CAD models. The governance overhead is substantial.