Yep, it's up to the community to create the parts used within the builder before it can be used. Click on Draw New Part and pick a part to contribute! There's a helpful video in the lower left of the page that explains how to design new parts.
Thanks but I'm confused. Aren't the parts already built, or is it a personal thing? I have to build the parts I require? I thought most parts were already built and we could use what's built....
@MarkGalgay yes you will be able to use parts other people have made. it's just that we are very early now and there are almost 200 parts to review now. 🙂