Again, you can use a library of basic shapes, and merge or subtract these to create more complex ones. This one is a web-based app, so no download is needed and once you’ve created an account you can access it on any computer. TinkerCAD is another simple option, although it’s a little more involved than 3D Builder (and also has more functions). This is probably the simplest 3D modelling app around.
You can use the subtract function to overlay shapes and then cut one from the other, which lets you create relatively complex objects from its small library of predefined shapes. On the other hand it does have a very simple and intuitive click-and-drag interface, and it lets you perform functions like adding or subtracting shapes.
It lacks features like the ability to bevel or radius edges, for example. 3D Builder does have some serious limitations.
