[Brodie Fairhall] has a nice video about how to use parameters in FreeCAD. The nice thing about parameters is they don’t have to be just constants. You can put in formulae as well. For example ...

Are you the kind of hacker who tries to pick up FreeCAD, but doesn’t want to go through a tutorial and instead pokes around the interface, trying to transfer the skills from a CAD suite you’ve ...

One all-in-one option is FreeCAD; CAD stands for Computer Aided Design. It's a free software package that can create and build 3D objects. By contrast, Cura is a free 3D "slicer" program that converts ...