Hi, my name is Will Tenny, and in this lesson we discuss extrude type features and how they're used to make multi-body parts. In this lesson, we are going to explore how to make a baby's bottle, like you would in a normal design and production team that you would be a part of. Usually it'll start with the engineering team or perhaps a project manager or product manager sharing a company CAD file or a company asset with you. In this case, this is the thread design that is used for all of the company's product lines, so that all the caps that they produce fit with all the bottles. And oftentimes this will be shared with you, and you can build or design around it. We've imported this as a part inside of our part file so that we can use this as our design reference. And moving forward, we've been able to begin using extrude features to build around it. So let's look at what those features were. First things first, as you can see I've got them grouped in this folder. As a reminder, you can do that by selecting two or more features, right-clicking, and selecting Add to New Folder, after that you can name the folder to stay organized. So when the part was first brought in, it looked like this. It had a thread, it had the shoulders of the bottle, the rest is left up to us. The next thing we did was we offset from that outer thread circle by about a sixteenth of an inch, and then we went ahead and extruded that with draft. And just as a reminder, those draft buttons occur at the end of each of the direction menus, direction one and direction two. And you usually want to set the drafts so that if you're extruding in two directions, they are parallel to one another. If I were to change the direction of one or the other, you can see how it creates a problem with draft. So these look like they're well aligned, let's leave that alone. Also, when we brought in this part for the first time, we had the choice of bringing in different aspects of the part with it. The number of bodies, the sketches, the planes, the equations, whatever we needed. And for this particular CAD asset, we chose to bring in the solid bodies, of course we need that. We chose to bring in the planes in case we need them. At the moment I have them all hidden, we can unhide them by selecting this Show button, this little eyeball here. We brought in the sketches because they give us some indication about how the thread was designed. They also have some names that help us to reference some design intent if we decide to apply that to future features. I think pitch will be an important one. Also wall thickness would also be important. We set our wall thickness for this particular part at one millimeter, just as a reference. So these are all good things to keep in mind. Especially with imported parts or shared CAD assets between members and a team. Once the boss extrude was complete, let's go ahead and isolate this feature so we can see more about it. We then shelled it, and we shelled it to the thickness that was shared with us in the imported part, which as I said before was one millimeter, which expressed in inches, is 0.03937. If we select a show preview, it shows us how that shelling is done, we click the green check mark, and the shell is complete. Thanks for listening. In the next lesson we discuss revolve and suite features and how they're used to make multi-body parts.