FreeCAD 1.1: The Beginners' Guide to Parametric 3D Modeling for Print

FreeCAD 1.1 is the open-source CAD package that lets you design parts for 3D printing without a subscription. This guide covers the essentials: installing FreeCAD, creating constrained sketches, turning a sketch into a solid body, and exporting an STL ready for your slicer.

Purpose

Design parametric 3D models you can modify by changing dimensions — not static geometry you’d have to redraw from scratch. FreeCAD 1.1 adds a rewritten Assembly Workbench for multi-part assemblies and improved stability over 0.21.

Pre-requisites

• FreeCAD 1.1 installed (free from freecad.org)
• Basic comfort with navigating a 3D viewport (middle mouse to orbit, scroll to zoom)
• A Bambu Lab, Prusa, or any FDM printer with a slicer ready to test

Steps

1. Set up the Part Design Workbench. Launch FreeCAD, open a new document, and switch the workbench dropdown to “Part Design.” This is the core modeling environment for printable solid parts.

2. Create a new Body and Sketch. Click “Body” → “New Sketch.” Select the XY plane as your sketch plane. You’re now in 2D sketch mode where you’ll draw the profile of your part.

3. Draw and constrain your profile. Use the Polyline or Circle tools to draw a rough shape. Then apply constraints: “Constrain distance” for dimensions, “Constrain coincident” to lock points together. A fully-constrained sketch turns green — that’s your signal the geometry is defined.

4. Extrude to a solid. Leave sketch mode. Click “Pad” and enter your extrusion length. Your 2D profile becomes a 3D solid.

5. Add features with Pocket and Fillet. Create a new sketch on any face to cut a hole (“Pocket”) or round edges (“Fillet”). These operations stack in the Model tree on the left — click any step to go back and edit it.

6. Apply FreeCAD 1.1’s Assembly Workbench (optional). For multi-part designs, switch to the Assembly Workbench and use “Create Assembly” to combine bodies with joint constraints. The rewritten Assembly Workbench in 1.1 is substantially more stable than previous versions.

7. Export STL. File → Export → STL Mesh. Set the mesh deviation to 0.01mm for smooth curves without massive file sizes. Open in your slicer and verify geometry before printing.

The Trap

Skipping constraints. Unconstrained geometry looks correct on screen but moves when you edit later dimensions — causing cascading failures in parts that depend on those dimensions. Always confirm your sketch turns green before extruding.

Cited References

• FreeCAD 1.1 download and release notes
• FreeCAD 1.1 Ultimate Beginners Crash Course — YouTube
• FreeCAD 1.1 Assembly Workbench Crash Course — YouTube

Source: YouTube — FreeCAD 1.1 Crash Course

Content created with AI assistance and reviewed for accuracy.