Solids are nothing more than groups or components that: The Solid Tools operate on a special class of entities called (you’ll never guess) Solids. It helps to think to yourself, “Use this to cut that” as you’re clicking. For Subtract and Trim, click the cutting object first, then the Solid you want that object to cut. For Union, Intersect and Split, it doesn’t matter what order you go in. Just activate the tool you want to use, then start clicking on Solids in your model. Split takes two Solids and turns them into three it’s a lot like doing two Subtract operations and an Intersect all at once.Want to model joinery or other close-fitting parts? Trim is your tool. Trim (which is probably the most useful of the bunch) is a lot like Subtract, except that it doesn’t delete the Solid you use as a cutting object.Subtract uses one Solid as a “cutting object” to remove part of another.Intersect creates a new Solid out of the parts of multiple Solids that overlap.Union takes two or more Solids and combines them into a single form.Plenty of 3D forms are much easier to make this way – you’ll find uses for them all over the place. You do so by adding them together, subtracting one from the other, and finding the areas that they have in common. It’s really not as complicated as it sounds basically, you use the Solid Tools to generate forms using other forms in your models. The all-new Solid Tools let you perform additive and subtractive modeling tasks (some folks call them Boolean operations) on subsets of your geometry.

Every new SketchUp release contains at least one modeling tool that’s guaranteed to save you a ton of time and effort.

Sketchup make solid