this post was submitted on 27 Jun 2024
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FreeCAD
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Your own 3D parametric modeler.
FreeCAD is an open-source parametric 3D modeler made primarily to design real-life objects of any size. Parametric modeling allows you to easily modify your design by going back into your model history and changing its parameters.
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I haven't had a chance to try FreeCAD, but this is generally good advice in other parametric CAD tools, too. Create "skeleton" features early on (planes, datums, simple sketches) and define later features by referencing the skeleton as much as possible. It avoids creating a long chain of feature dependencies where Feature A changes and breaks Feature B, which breaks Feature C, etc.