Some CAD tools let you do both, but many 3D printer users wind up using OpenSCAD which is fully parametric. If you’ve used OpenSCAD you know that it is like a simple programming language ...

Known as “The Programmers Solid 3D CAD Modeller”, OpenSCAD is used by many people for whom writing code comes more naturally than learning a fiddly user interface. It’s a very capable piece ...