3D Similarity Search in PLM for Part Reuse

When You Know the Part Exists but Cannot Find It

“I know we designed something like this before. Where is it?”

That is a common question in engineering teams, especially when product libraries grow over time and contain thousands of CAD parts, assemblies, and variants.

In theory, finding an existing part should be simple. Search by part number, name, description, or category and retrieve the result.

In practice, it often is not that easy.

Sometimes the engineer does not know the part number. Sometimes the naming is inconsistent. Sometimes similar parts were created by different teams, in different projects, or years apart. And sometimes the only thing a user really knows is this: “I remember a part that looked like this.”

This is where 3D Similarity Search in PLM becomes valuable.

Instead of relying only on names, tags, or manually assigned descriptions, 3D similarity search uses the geometry of the part itself as the basis for search. It helps teams find geometrically similar components across the product library, making it easier to reuse existing designs, reduce duplicate parts, and improve standardization.

With Nora IPLM, this capability supports not only engineering reuse, but also broader business goals across procurement, cost engineering, operations, and product governance.

Why Traditional Part Search Often Falls Short

Most engineering organizations already have a large library of product data. That library may include CAD parts, assemblies, BOMs, drawings, documents, revisions, legacy product records, and supplier-linked components.

The problem is not always a lack of data. The problem is often how difficult that data is to search and reuse effectively.

Traditional search methods usually depend on:

• part numbers
• item names
• descriptions
• manually assigned attributes
• category labels
• keyword searches

These methods work well when users already know exactly what they are looking for. But many reuse opportunities are missed because users do not know the right keyword or part number.

A bracket may already exist in the library, but one engineer named it “mounting bracket,” another named it “support angle,” and a third created a nearly identical version under a new item number.

As a result, companies often end up with:

• duplicate or near-duplicate parts
• unnecessary new part creation
• more engineering effort than needed
• excess inventory complexity
• more suppliers and purchasing activity
• lower part standardization across products

What Is 3D Similarity Search in PLM?

3D Similarity Search is a capability that identifies and ranks parts based on their geometric similarity.

Instead of asking, “What is this part called?”, the system can answer a more useful question: “What other parts in our library are geometrically similar to this one?”

In a PLM environment, this means a team can use a part from a BOM, CAD record, or product structure as the search input and retrieve a ranked list of similar parts already stored in the system.

This is especially useful for:

• design reuse
• duplicate part detection
• part standardization
• rationalization programs
• cost reduction efforts
• engineering efficiency

With Nora IPLM, geometry becomes more than something users simply view. It becomes something they can search, compare, and reuse across the product environment.

Why 3D Similarity Search Matters

1. Reduce Duplicate Parts

Many organizations create duplicate parts without realizing it. A team designs a new part because it cannot find an existing one quickly enough. Later, another team creates something similar for a different program. Over time, the library fills with multiple versions of nearly the same thing. 3D similarity search helps expose these overlaps by finding similar geometry that might otherwise remain hidden.

2. Improve Design Reuse

Engineering time is valuable. If a part already exists and meets the requirement, it is often more efficient to reuse it than to design a new one from scratch. Similarity search supports that decision by helping engineers identify reusable candidates early in the design process.

3. Support Standardization

Standardization is not just an engineering goal. It affects procurement, sourcing, inventory, manufacturing simplicity, and quality consistency. When teams can see families of geometrically similar parts, they are better positioned to rationalize the library and reduce unnecessary variation.

4. Lower Cost and Complexity

Every unnecessary part can increase cost through extra engineering work, more supplier relationships, more purchase orders, more inventory lines, more quality and inspection effort, and more master-data maintenance. Reuse and standardization help reduce that complexity.

5. Improve Visibility Across the Product Library

Similarity search turns the product library into something more usable. Instead of being a large archive of isolated records, it becomes a searchable source of reusable engineering knowledge.

How 3D Similarity Search Helps Different Teams

Common Use Cases for 3D Similarity Search in PLM

Reuse an existing part instead of designing a new one: An engineer starts with a part in a BOM or product structure and wants to know whether a similar component already exists in the library.

Identify near-duplicate brackets, housings, or machined parts: The system helps find parts with similar geometry that may have been created under different names or part numbers.

Support part rationalization programs: A company reviews families of similar parts to identify opportunities for consolidation and standardization.

Reduce unnecessary library growth: Instead of continuously adding new items, teams can evaluate whether a current part can meet the requirement with little or no change.

Improve sourcing and inventory efficiency: By reducing unnecessary variants, organizations can simplify supplier and stock management.

Why PLM Is the Right Place for Similarity Search

A geometry search tool becomes much more powerful when it is connected to the broader product context inside PLM.

A similar part is not useful only because it looks similar. It is useful because the team can also understand its item record, revision and lifecycle state, where it is used, which BOMs it belongs to, which documents are attached, whether it is approved or obsolete, whether it already has supplier or sourcing context, and how it relates to the rest of the product structure.

That is why similarity search inside a PLM environment is more valuable than a standalone isolated geometry tool.

With Nora IPLM, users can move from geometric similarity to the surrounding product context that helps determine whether a part should actually be reused.

3D Similarity Search in Nora IPLM

Nora IPLM uses geometry itself as the search input to find and rank similar parts across the product library.

This allows teams to search using the shape of a part, identify reusable existing components, compare similar parts already stored in the system, support engineering reuse decisions, detect near-duplicates across the product environment, and support part rationalization and standardization efforts.

The value is not limited to one department. Engineering, procurement, cost engineering, and operations can all benefit from having a more searchable and reusable product library.

A simple example is starting from a part inside a BOM and asking the system to identify similar parts already available in Nora IPLM. Instead of relying only on names or descriptions, users can let the geometry guide the search.

This makes reuse more practical and more scalable, especially in organizations with large and growing engineering libraries.

Best Practices for Getting Value From Similarity Search

Maintain quality part records: Similarity results are more actionable when the related PLM data is accurate and current.

Define reuse expectations: Encourage teams to search for reusable parts before creating new ones.

Connect search to review workflows: If a similar part is found, teams should have a clear way to evaluate whether it is reusable, approved, and suitable for the intended application.

Use it for rationalization, not just design search: The value extends beyond daily engineering use. Similarity search can also support larger cleanup and standardization initiatives.

Link geometry with business context: Shape similarity is powerful, but better decisions come from combining geometry with revision status, lifecycle state, sourcing, and usage context.

Reuse Is Not Just an Engineering Benefit

Many companies think about reuse mainly as a design productivity topic. But the real impact is often broader.

• fewer duplicate parts
• cleaner BOMs
• lower part count growth
• better standardization
• simpler sourcing
• lower inventory complexity
• reduced operational overhead
• improved cross-team consistency

That is why 3D similarity search is not just a search feature. It is a capability that supports smarter product-data management across the business.

Conclusion

As product libraries grow, reuse becomes harder to achieve through manual search alone.

Part numbers, names, and descriptions still matter, but they are not always enough. Sometimes the fastest path to reuse starts with geometry.

3D Similarity Search in PLM helps teams find what they already have, reduce duplicate parts, and make better reuse decisions across engineering and beyond.

With Nora IPLM, geometry-based search becomes part of a connected product environment, where teams can not only find similar parts, but also understand their role in the broader product context.

That means less duplication, better standardization, and a more reusable product library over time.

If your teams are asking, “Did we already design something like this?”, 3D similarity search is one of the most practical ways to answer that question.