2026-04-14 11:39:47cloudy-jc:
Resize FreeCAD images to width=600 using OtterWiki thumbnails
FreeCAD Extension.md ..
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FreeCAD is free, open source, and runs on Windows, Mac, Linux and Raspberry Pi. There is no account to make and nothing to pay for.
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*FreeCAD 1.0 in the Part Design workbench. The tree on the left shows every step used to build the model. Image by Maxwxyz, [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/), via [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:FreeCAD_1.0_Light_PartDesign_Pozidriv.png).*
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*FreeCAD 1.0 in the Part Design workbench. The tree on the left shows every step used to build the model. Image by Maxwxyz, [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/), via [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:FreeCAD_1.0_Light_PartDesign_Pozidriv.png?width=600).*
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Create a new sketch on the XY plane. Draw a circle, then add a **diameter constraint** and type the number — say, 80 mm for a hat that sits over a 72 mm Sphero. Constraints are what make FreeCAD parametric: the circle isn't just "about that big", it's exactly 80 mm, and FreeCAD remembers that rule. ([Sketcher docs](https://wiki.freecad.org/Sketcher_Workbench))
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*A sketch with constraints. The white dimension arrows lock the shape to exact measurements. CC0, via [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:FreeCAD_PartDesign_Sketch.png).*
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*A sketch with constraints. The white dimension arrows lock the shape to exact measurements. CC0, via [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:FreeCAD_PartDesign_Sketch.png?width=600).*
### Step 3 — Pad it into a disc
Close the sketch, then use **Pad** to push it upwards by 10 mm. You now have a solid puck — a flat cylinder. ([Pad docs](https://wiki.freecad.org/PartDesign_Pad))
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*After padding the sketch, you get a solid 3D shape. CC0, via [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:FreeCAD_PartDesign_Pad.png).*
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*After padding the sketch, you get a solid 3D shape. CC0, via [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:FreeCAD_PartDesign_Pad.png?width=600).*
