Learn how to navigate FreeCAD efficiently with this step-by-step guide. From installation to advanced features, become a FreeCAD pro in no time!

Introduction to FreeCAD: A Comprehensive Beginner’s Guide
FreeCAD is an open-source 3D CAD modeler that helps engineers, designers, and hobbyists to create 3D models for various applications. It is packed with features and tools that allow you to design complex geometries, customize parameters, and visualize your designs in a user-friendly interface. In this guide, we will walk you through the essential steps to get started with FreeCAD, from installation to basic modeling techniques.

FreeCAD is a powerful and versatile design tool that caters to both beginners and experienced users. By configuring preferences, using workbenches effectively, and understanding essential sketching and modeling tools, you can achieve great results in your design projects.

Downloading and Installing FreeCAD
Getting started with FreeCAD is straightforward. First, visit the FreeCAD website where you can find the latest stable version of the software. The link is typically provided in the video description or on the website itself. Once you locate the latest stable version number, scroll down to see what’s new in this version.

Choosing the Correct Version
Before downloading, ensure you select the version appropriate for your operating system. For this guide, we will use the Windows 64-bit installer. However, FreeCAD is available for other platforms such as macOS and Linux.

Running the Installation
Upon downloading, run the installation file to set up FreeCAD on your computer. Follow the on-screen instructions to complete the installation process. Once installed, launch FreeCAD to begin configuring the software to suit your preferences.

STEP and STL files are very common file formats when it comes to digital file exchange in the CAD and 3D printing  world. It’s possible to convert STL files to STEP files in FreeCAD.

You may have an STL file that you want to use as a STEP file somewhere. Here’s what to do. First you have to drag the STL file(s) inside your empty FreeCAD window or open it from within the software (without a document open). Then all you have to do is taking a few steps to export it as a STEP file.

The color added to the STL file, will also be saved within the STEP file.

The video below shows how you can change an STL file to a STEP file. The Part workbench is used for this. If you just want to read how to do this, continue reading below the video.

Like ironing clothes, ironing for 3D printing involves using heat to smooth out a surface. This is achieved on a 3D printer by moving the nozzle back and forth over the top layer.

Some 3D prints may need a perfect top layer to add a better look to it. Then the ironing feature can come in handy. You can enable this feature in your slicer, like Simplify3D or Cura.

The ironing feature is most suitable for flat objects, like nameplates for example. Note that it takes more time to finish a 3D print when you use this feature.

You may think, i always want that! But that’s not recommended. When you 3D print curved models, it has no point to turn the ironing feature on. The ironing feature is most suitable for flat objects, like nameplates for example. Note that it takes more time to finish a 3D print when you use this feature.

A STEP file (.stp) is a very common file format when it comes to digital file exchange in the CAD world. It’s possible to import and edit STEP files online. You can do this with the free CAD software called FreeCAD.

When you have a STEP file ready to use, you can just drag it inside your empty FreeCAD window or open it from within the software with the import feature. Then create a new document first, click ‘File’ and then ‘Import’ and select the STEP file.

FreeCAD is a great tool to import and edit STEP files. When using this free CAD software, importing STEP files is one of its great features.

Below you can watch my video about editing a STEP file in FreeCAD. In this video, the Part Design and Sketcher workbench were used to add pins and cut holes from a sketch that was added to the original STEP model.

What is gear ratio? It’s actually a simple formula that shows how gears can work together. I will show you how it works in this blog. Or if you want to see a more tangible example, you can watch the linked video!

A gear is designed to transmit movement to other gears. A set of gears will result in a specific gear ratio. To keep it simple, we will calculate the gear ratio between two gears only. So there’s one drive gear and one driven gear.
You can visualize those involute gears in FreeCAD by generating them on your screen. You can do that in the Part Design workbench. They must both have the same Module to work together. The Module is the unit that defines the size of a gear.

When positioning two gears, you can calculate the correct distance between them with the formula below. T is the number of teeth.

Module * (T1 + T2)) / 2 = (2.50 * (10 + 8)) / 2 = 22.5. 
In this example one gear has 10 teeth and the other 8.

The gear ratio can be defined as: Teeth (green driven gear) / Teeth (red drive gear) = 8 / 10 = 0.8. A gear ratio lower than 1 means that it’s an overdrive gear transmission with a higher output speed. If the gear ratio is higher than 1, the output speed is lower than the input speed.

With FreeCAD you can generate involute gears in the Part Design workbench. A perfect free tool for simulating (3D printed) gears together.

If you want to see a visualisation of the steps above, the video below will show you how i generated gears in FreeCAD and 3D printed them to get a real example.