Open-design is a movement that consists of the development of physical products by sharing its design information publicly.
It’s a co-creation process between the designer and the user. Because of that, often times they are free and shared online.
Don’t sell your soul on account of a few discounts. Once you consider everything, you will see that you spent more money than you planned and all for nothing. By the end of the day, you just have more stuff but aren’t necessarily happier.