Introduction to OpenSCAD | Mafagrafos Blog

OpenSCAD is a free and open-source software for creating 3D CAD objects. Unlike traditional CAD programs that use interactive modeling, OpenSCAD adopts a script-based approach where you describe your 3D models in code. This makes it particularly powerful for:

Parametric design: Easily adjust dimensions and create variations of your models
Precision modeling: Define exact measurements and relationships between parts
Version control: Track changes in your designs using Git or other version control systems
Reproducibility: Share code that others can modify and customize

OpenSCAD is perfect for makers, engineers, and anyone who enjoys a programmatic approach to 3D modeling.

How to Download and Install OpenSCAD

To get started with OpenSCAD, you’ll need to download the software from the official website.

Download Link

Visit the official OpenSCAD downloads page: https://openscad.org/downloads.html

Important: Download the Developer Snapshot

Make sure to download the Developer Snapshot, not the stable version. Development snapshots include newer features, bug fixes, and performance improvements that significantly enhance your OpenSCAD experience. These snapshots are generally stable enough for daily use and provide access to newer functionalities like improved text rendering and faster operations.

Look for the “Development Snapshots” section on the downloads page and choose the appropriate version for your operating system:

Windows: Download the .exe installer
macOS: Download the .dmg file
Linux: Download the .AppImage or use your distribution’s package manager

After downloading, follow the standard installation procedure for your operating system.

Installing the BOSL2 Library (Optional but Highly Recommended)

BOSL2 (Belfry OpenSCAD Library v2) is a powerful library that extends OpenSCAD’s capabilities with hundreds of useful functions, shapes, and utilities. It makes complex operations much simpler and helps you write cleaner code.

Why Use BOSL2?

Extensive collection of shapes and modules
Advanced rounding and chamfering tools
Attachment system for easier part positioning
Mathematical utilities and helper functions
Well-documented with many examples

Installation Steps

Locate your OpenSCAD libraries directory:
- Windows: Documents\OpenSCAD\libraries
- macOS: ~/Documents/OpenSCAD/libraries
- Linux: ~/.local/share/OpenSCAD/libraries
If the libraries folder doesn’t exist, create it.
Download BOSL2:

Visit the BOSL2 GitHub repository: https://github.com/BelfrySCAD/BOSL2

You can:
- Click the green “Code” button and select “Download ZIP”
- Or clone the repository using Git:
```
cd ~/Documents/OpenSCAD/libraries # or your libraries path
git clone https://github.com/BelfrySCAD/BOSL2.git
```
Extract and place the files:

If you downloaded the ZIP file, extract it and rename the folder to BOSL2. Move this folder to your OpenSCAD libraries directory.
Verify the installation:

Open OpenSCAD and try running this code:
```
include <BOSL2/std.scad>

cuboid([30, 40, 50], rounding=5);
```
If you see a rounded box, BOSL2 is installed correctly!

Installing the OpenSCAD Extension for VSCode (Optional but Highly Recommended)

OpenSCAD has a built-in text editor, but it’s limited in terms of AI integration, autocomplete, and syntax highlighting. If you prefer working in a modern code editor, you can develop OpenSCAD projects in Visual Studio Code with syntax highlighting, autocomplete, and AI integration.

Why Use VSCode for OpenSCAD?

Modern code editor with excellent syntax highlighting
Autocomplete and IntelliSense
Integrated preview of your models
Built-in Git integration
Extensive customization options

Installation Steps

Install Visual Studio Code:

If you don’t have VSCode installed, download it from: https://code.visualstudio.com/
Install the OpenSCAD extension:
- Open VSCode
- Click the Extensions icon in the sidebar (or press Ctrl+Shift+X / Cmd+Shift+X)
- Search for “OpenSCAD” in the marketplace
- Install the extension by Antyos (one of the most popular options)
Configure the extension:
- Open VSCode settings (File > Preferences > Settings or Cmd+, / Ctrl+,)
- Search for “OpenSCAD”
- Set the path to your OpenSCAD executable if not automatically detected
Start coding:
- Create a new file with the .scad extension
- Write your OpenSCAD code
- Use the extension’s preview feature to see your model without leaving VSCode

Essential Settings

After installing OpenSCAD, you’ll want to configure some important settings to get the best experience.

Enable Important Features

Open OpenSCAD
Go to Edit > Preferences (or OpenSCAD > Settings on macOS)
Navigate to the Features tab
Enable all features, paying special attention to:
- textmetrics: Enables better text rendering and measurement
- lazy-union: Improves performance by optimizing union operations

These features improve performance and add useful capabilities to OpenSCAD.

Enable Automatic Reload and Preview

For a smoother workflow, enable automatic reload and preview:

In the OpenSCAD menu, go to Design
Check Automatic Reload and Preview

With this enabled, OpenSCAD will automatically reload and preview your model whenever you save your .scad file. This creates a fast feedback loop, making development much more efficient.

Next Steps

Now that you have OpenSCAD installed and configured, you’re ready to start creating! Here are some resources to help you learn:

Official OpenSCAD Manual: https://openscad.org/documentation.html
BOSL2 Documentation: https://github.com/BelfrySCAD/BOSL2/wiki

I highly recommend starting with the BOSL2 wiki. It has many tutorials and is very comprehensive. In my day-to-day work, I don’t even look at the OpenSCAD documentation, only the BOSL2 one.

Happy 3D code modeling! 🎨