you can do create some objects, but you can't use them unless you pay! no advanced features, just a simple download is impossible! That it's free is meaningless! By the way, you can't set the thickness of the pipe! The interface is pretty clean though!
Developer reply
Thanks for your feedback. Basic 3D modeling is available for free, while some advanced CAD tools and features require an upgrade. We’re continuously improving 3D Print Designer, including tools for tubes, wall thickness and 3D printing. We’re glad you find the user interface clear and easy to use!