alt Hacker NewsOpenSCAD is the only CAD tool I use. I can'd figure out how to operate a graphical 3D software with a 2D GUI so it's just easier to describe things mathematically.
I just wish it had operations for subtractively chamfering, rounding, etc. as doing minkowski() with cones and spheres to achieve that result can be unwieldy.
Do you know about BOSL2? It can do rounding or chamfering very easily.
cuboid([20, 20, 30], chamfer=5);