When a bracket, enclosure, or other part needs exact dimensions, FreeCAD lets you build a parametric 3D model from constrained sketches. The model keeps a history of its operations, so changing a parameter can update the design without rebuilding it from scratch.
From constrained sketches to editable solids
A typical part starts with a 2D sketch. Add geometric constraints and dimensions to define its shape, then use that sketch as the basis for a 3D object. FreeCAD records modeling operations in a history; changing an earlier parameter can carry through to later features in the model.
This history-based approach suits parts with dimensions that may change during design. It also gives students and hobbyists a way to practice how sketches, constraints, and model features relate to one another.
What can FreeCAD do with a finished model?
FreeCAD can turn 3D geometry into technical drawings by extracting design details and adjusting dimensions. For sharing or moving work between applications, it reads and writes formats including STEP, IGES, STL, SVG, DXF, OBJ, IFC, and DAE.
- Use STL when preparing a model for a 3D-printing workflow.
- Create dimensioned production drawings from 3D designs.
- Exchange model geometry through formats such as STEP and IGES.
Workbenches for engineering tasks
FreeCAD groups specialized tools into workbenches. Alongside general modeling, the software includes tools for building information modeling (BIM), computer-aided manufacturing and CNC, geodata, and finite element analysis (FEA). A robot simulation module studies robot movements; the computational fluid dynamics (CFD) workbench is experimental.
A project built around design history
For a dimension-driven component, the workflow is to sketch its profile, constrain the geometry, create a 3D form, and refine it through additional modeling operations. When a dimension changes, edit the relevant parameter in the history and inspect the resulting model. Workbench tools then support tasks such as drawing creation or analysis.
Pros
- Edits to model parameters can update the design history
- Constrained 2D sketches provide a foundation for 3D objects
- Exports include STEP, IGES, STL, SVG, DXF, and IFC
- Dedicated workbenches cover BIM, CAM/CNC, FEA, and geodata
Cons
- The computational fluid dynamics workbench is experimental
System requirements: Windows 7, Windows 8, Windows 10, Windows 11 · 64-bit only
Can FreeCAD create technical drawings from a 3D model?
Yes. It can extract design details from 3D models and use dimensions to create production drawings.
Can a FreeCAD model be changed after it is created?
Yes. Parametric modeling stores operations in a model history, where changing parameters can update the design.
Which file formats does FreeCAD support?
It reads and writes formats including STEP, IGES, STL, SVG, DXF, OBJ, IFC, and DAE.
