Introduction to FreeCAD Part 5: Patterns and Boolean Operations | DigiKey

In this episode of our FreeCAD tutorial series, we delve into the powerful features of patterns and Boolean operations to enhance your 3D modeling skills. We'll guide you through the process of designing a custom servo horn that seamlessly attaches to a micro servo motor and connects with LEGO® Technic parts, bridging the gap between digital design and physical prototyping.
This is the fifth video in our 10-part Introduction to FreeCAD series. You can find the FreeCAD files used in this tutorial in this GitHub repository: https://github.com/ShawnHymel/introduction-to-freecad

The written version of this guide can be found here: https://www.digikey.com/en/maker/tutorials/2025/intro-to-freecad-part-5-patterns-and-boolean-operations

We kick off by exploring array patterns in FreeCAD, both linear and polar, to simplify the replication of features around an axis or along a path. You'll learn how to create a polar pattern to efficiently replicate holes around a circular disc—an essential skill for creating components like our servo horn.
Next, we dive into Boolean operations, demonstrating how to add and subtract parts within your model to achieve complex geometries. By importing a servo motor model, we extract and adjust the servo shaft to use it in a Boolean cut operation. This technique allows us to create a precise fit between the servo horn and the servo shaft, ensuring a snug and functional connection.

Throughout the tutorial, we emphasize best practices in FreeCAD, such as using SubShapeBinders for reference geometry and properly aligning imported models. We also address common challenges like scaling and aligning parts, providing practical solutions to help you overcome these obstacles in your own projects.

Once the design is complete, we prepare the model for 3D printing. We'll discuss important considerations like part orientation, tolerances, and post-processing steps to achieve a perfect fit with your physical components. By the end of the video, you'll have a custom-designed servo horn ready to be integrated into your projects, opening up new possibilities in mechanical design and prototyping.

Whether you're a hobbyist looking to enhance your 3D printing projects or a professional aiming to deepen your CAD modeling skills, this tutorial offers valuable insights into FreeCAD's advanced features. Join us to unlock the potential of patterns and Boolean operations in your designs and take your prototyping to the next level.

00:00 Intro
01:18 Involute Gear Tool
02:31 Import Servo Motor CAD Model
06:21 Design Servo Horn Disc
12:14 Create Peg Hole
13:17 Polar Pattern
15:43 Clone and Scale Servo Shaft
18:40 Alignment Tool
22:20 Boolean Cut
23:35 Chamfer Edges
24:18 Exporting for 3D Printing
26:07 Challenge: Custom Servo Horn
26:16 Conclusion

LulzBot SideKick 747 3D Printer: https://www.digikey.com/en/products/detail/lulzbot/KT-PR0058-BS1MLRP/16186574
3D printer filament: https://www.digikey.com/en/products/filter/3d-printing-materials/944?s=N4IgTCBcDaIGYEsA2BDAtgUwHYBcQF0BfIA
SG-90 Micro Servo Motor: https://www.digikey.com/en/products/detail/gearbox-labs/PART-MICRO-SERVO-SG-90-ANALOG/16159912

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