@Daniel Sloan yes but I have a 3D artist background so I'm familiar with Blender and some other 3D tools. On Maker World you can download the CAD file sometimes instead of the 3DM file, I believe it is, and open it in one of those other 3D packages and make edits to them. Some designs are more editable than others but you can make revisions to them. I had a servo kit where the holes were too big and the heat set inserts weren't fitting properly. I downloaded the CAD model, shrunk the holes, and reprinted it as just a quick example. You can also check out TinkerCAD. It's a free 3D modeling package. I've heard it's better than SketchUp from a 3D modeling perspective. You might like it. It's pretty intuitive and easy to pick up.