FreeCAD Part Design vs Part Workbench: What’s the Difference?

If you are new to FreeCAD, one of the first confusing choices you will face is this:

Should you use the Part Workbench or the Part Design Workbench?

Both can be used to create 3D geometry, but they follow different modeling approaches. Choosing the right workbench can make your workflow much easier—especially when you start creating mechanical parts, assemblies, or complex designs.

In this guide, we’ll explain the difference between FreeCAD Part Design and Part Workbench, how each one works, when to use them, and which workbench beginners should learn first.

What Is a Workbench in FreeCAD?

A workbench in FreeCAD is a collection of tools designed for a particular type of CAD task.

For example, FreeCAD includes workbenches for:

• Part modeling
• Part Design
• Sketching
• Technical drawings
• Assemblies
• Architecture
• Surface modeling
• FEM analysis
• Mesh operations

The Part and Part Design workbenches are two of the most important options for creating solid models.

Although they can sometimes accomplish similar tasks, their modeling philosophies are different.

What Is the FreeCAD Part Workbench?

The Part Workbench provides fundamental tools for creating and manipulating solid geometry.

It is based largely on Constructive Solid Geometry (CSG). Instead of building one continuous model through a feature history, you can create individual geometric objects and combine, cut, or intersect them.

FreeCAD's documentation describes Part as providing basic tools such as primitives and Boolean operations, while serving as a foundation for much of FreeCAD's geometry system.

Common Part Workbench Tools

Some commonly used Part tools include:

• Box
• Cylinder
• Sphere
• Cone
• Torus
• Prism
• Boolean Union
• Boolean Cut
• Boolean Intersection
• Extrude
• Revolve
• Fillet
• Chamfer
• Create primitives

For example, imagine you want to create a simple mechanical housing. You could:

1. Create a box.
2. Create a cylinder.
3. Position the cylinder.
4. Use Boolean Cut.
5. Create another cylinder.
6. Cut it from the housing.

This approach is based on combining and modifying individual shapes.

What Is the FreeCAD Part Design Workbench?

The Part Design Workbench uses a feature-based modeling approach.

Instead of primarily creating independent solids and combining them with Boolean operations, you generally create a Body, add sketches, and build the final solid through a sequence of features.

FreeCAD's documentation describes Part Design as being focused on solid components and using a feature-based methodology in which a Body contains cumulative features.

A typical workflow looks like this:

Sketch → Pad → Sketch → Pocket → Fillet → Final Part

For example, to create a mounting bracket:

1. Create a Body.
2. Create a Sketch.
3. Add dimensions and constraints.
4. Use Pad to create the base.
5. Create another sketch on a face.
6. Use Pocket to create holes.
7. Add Fillets.
8. Add Chamfers if required.

Each feature contributes to the final model.

Part vs Part Design: The Core Difference

The easiest way to understand the difference is:

• Part Workbench = Build and manipulate separate geometric objects.
• Part Design = Build a part progressively through a feature-based Body.

Think of the Part Workbench like building something from individual blocks.

Part Design is more like manufacturing a component step by step from a design history.

Part Workbench vs Part Design Workbench

The distinction is not that one workbench is "better" in every situation. They are designed around different workflows.

1. How Modeling Works in Part Workbench

Let's say you want to make a simple flange. Using Part, you could create:

• A cylinder for the main body
• A smaller cylinder to subtract the center hole
• Additional cylinders for bolt holes
• Boolean cuts to create those holes

The model is essentially created by manipulating separate shapes. For example:

Cylinder A + Cylinder B → Union
or:
Cylinder A − Cylinder B → Cut

This can be extremely useful when working with primitives and Boolean operations.

2. How Modeling Works in Part Design

Now imagine creating the same flange using Part Design. You might:

1. Create a Body.
2. Create a sketch.
3. Draw the flange profile.
4. Pad the sketch.
5. Create a sketch for the center hole.
6. Pocket the hole.
7. Create another sketch for bolt holes.
8. Pocket the bolt-hole pattern.
9. Add fillets or chamfers.

The resulting model has a feature history that describes how the part was created. This is one of the biggest advantages of Part Design for mechanical modeling.

Understanding the Body in Part Design

The Body is one of the most important concepts to understand when learning Part Design.

A Body acts as a container for the features that make up a component.

A simplified model tree might look like:

Each feature builds on the previous result.

FreeCAD's documentation explains that the Body contains the cumulative features defining the component, with features commonly created from sketches through additive or subtractive operations.

This makes the model history easier to understand and modify.

What Are Additive and Subtractive Features?

Part Design commonly uses two types of operations.

Additive Features

These add material to your model. Examples include:

• Pad
• Additive Box
• Additive Cylinder
• Additive Sphere
• Additive Loft
• Additive Revolution

For example: Sketch → Pad → Solid

Subtractive Features

These remove material from your model. Examples include:

• Pocket
• Subtractive Box
• Subtractive Cylinder
• Subtractive Sphere
• Subtractive Loft
• Groove

For example: Solid → Sketch → Pocket → Hole

This add/remove workflow is particularly useful for mechanical component design.

Boolean Operations in the Part Workbench

Boolean operations are especially important in the Part Workbench. The three basic Boolean operations are:

• Union: Combines solids into a single result.
  A + B = Union
• Cut: Subtracts one shape from another.
  A − B = Cut
• Common: Keeps only the overlapping region between two shapes.
  A ∩ B = Common

These operations are useful when your model is naturally described as a collection of geometric solids.

When Should You Use Part Design?

Part Design is usually a strong choice when you are creating mechanical components that are built progressively from sketches and features.

For example:

• Brackets
• Mounting plates
• Machine components
• Housings
• Levers
• Shafts
• Mechanical covers
• Clamps
• Flanges
• Structural components

If your modeling process sounds like: "First I'll create the base, then add this feature, then cut this hole, then add a fillet..." — Part Design is often a natural fit.

When Should You Use Part Workbench?

Part is useful when you need more direct control over individual geometric objects. It can be particularly useful for:

• Primitive-based modeling
• Boolean operations
• Creating independent solids
• Geometry manipulation
• Certain complex geometric constructions
• Workflows involving multiple separate shapes
• Working with geometry generated by other workbenches

The Part Workbench can also be useful when you don't want your model constrained to the single-body feature workflow of Part Design.

Part Design vs Part: A Simple Example

Imagine you want to create a simple mechanical bracket.

Part Workbench Approach

You might create:

1. Box for the base
2. Box for the vertical wall
3. Union the boxes
4. Cylinder for the hole
5. Boolean Cut
6. Apply fillet

Part Design Approach

You might create:

1. Body
2. Sketch
3. Pad
4. Sketch on a face
5. Pocket
6. Fillet

Both approaches can produce a similar final shape. The major difference is how you construct and manage the model.

Which Is Better for Beginners?

For someone completely new to FreeCAD and coming from a traditional mechanical CAD background, Part Design is often the best starting point for learning feature-based mechanical modeling.

Why? Because it encourages a structured workflow: Sketch → Feature → Feature → Feature → Final Part

You learn important CAD concepts such as:

• Sketch constraints
• Parametric dimensions
• Features
• Design history
• Additive modeling
• Subtractive modeling
• Fillets
• Chamfers
• Model dependencies

FreeCAD's own beginner Part Design tutorial follows this type of workflow, starting from a sketch and progressively adding or removing material through features.

However, learning Part is still valuable because it gives you a better understanding of FreeCAD's underlying geometry tools and Boolean modeling.

Can You Use Part and Part Design Together?

Yes. You don't have to choose one workbench permanently.

FreeCAD is designed around multiple workbenches, and geometry can be used across different workflows. For example, you might:

• Build your main mechanical component using Part Design.
• Create or manipulate additional geometry using Part.
• Use another workbench for specialized operations.
• Create technical drawings using TechDraw.

This is one reason why understanding both workbenches is useful as you progress from beginner to intermediate FreeCAD user.

Common Beginner Mistakes

1. Choosing Part Just Because It Says "Part"

The names can be confusing. "Part" doesn't mean it is the only workbench for making parts. Part Design is specifically designed around creating solid components through a feature-based workflow.

2. Creating Everything With Boolean Operations

Boolean modeling is powerful, but using it for every mechanical component can make some designs harder to edit. For many mechanical parts, sketches and parametric features provide a more organized workflow.

3. Ignoring the Model Tree

The model tree is critical in Part Design. Instead of viewing it as a list of objects, think of it as the recipe used to create your part. If the recipe is well organized, future modifications become easier.

4. Not Learning Sketch Constraints

If you're using Part Design, Sketcher is extremely important. Learn:

• Horizontal constraints
• Vertical constraints
• Coincident constraints
• Parallel constraints
• Perpendicular constraints
• Tangent constraints
• Dimensional constraints
• Symmetry
• Fully constrained sketches

Strong sketching skills will make your Part Design workflow much more reliable.

Part vs Part Design: Which One Should You Learn First?

Here's a simple recommendation:

Beginner – Start with:
Sketcher → Part Design → Basic Part
Learn how to create sketches, constrain them, and turn them into 3D features.

Intermediate – Then learn:
Part → Boolean Operations → Advanced Geometry
This gives you a broader understanding of FreeCAD's modeling capabilities.

Advanced – Eventually, combine multiple workbenches depending on the project:
Part Design + Part + TechDraw + Assembly
The goal isn't to use only one workbench. The goal is to know which tool is appropriate for the task.

Quick Decision Guide

Ask yourself these questions before starting a model:

• Do I want to build one mechanical component from sketches?
  Use Part Design.
• Do I want to combine multiple independent solids?
  Consider Part.
• Do I need lots of Boolean operations?
  Part may be more convenient.
• Do I want a structured feature history?
  Part Design is a strong choice.
• Am I creating a conventional mechanical component?
  Start with Part Design.
• Do I need flexible manipulation of separate geometric objects?
  Consider Part.

Part Workbench vs Part Design: Final Verdict

There isn't a universal winner.

Part Design is generally a great choice for structured, feature-based mechanical modeling. It is particularly useful when your design starts with sketches and develops through a sequence of additive and subtractive features.

Part provides a more direct and flexible approach to geometric modeling, particularly when working with primitives, Boolean operations, and independent shapes.

For beginners, a practical learning path is:

Sketcher → Part Design → Part → Advanced Workbenches

Once you understand both approaches, you'll be able to select the workflow that best matches the geometry you're trying to create.

Frequently Asked Questions

Conclusion

Understanding the difference between Part and Part Design is one of the most important steps when learning FreeCAD.

Remember the simple rule:

Part = flexible geometric modeling
Part Design = structured feature-based part modeling

Neither workbench replaces the other. As you become more comfortable with FreeCAD, you'll find that knowing both gives you much more flexibility.

Start with Part Design for your core mechanical modeling skills, then expand your knowledge with Part and other FreeCAD workbenches as your projects become more complex.