FreeCAD is open source, and it tends to attract a lot of people with this kind of mindset. Then some of us will not (or try very hard not to) use a commercial program, even if it's free, for philosophical reasons. I have Windows 7 on my home PC but do not use it, in fact I plan on removing it from my PC soon. Double and triple clicks help you select closed paths and solids in 3d.You will find that for many of us here, a Windows-only software is a show stopper, because we use one of the many available Linux distributions (some others use Macs). Just some common things which cannot be restored from videos: To move camera around selected object you need to hold middle mouse button pressed and to shift camera - hold also Shift button. Videos are without narration, but I tried to make them short and understandable.

I've made these three video tutorials to share my experience of using common tools and some useful tricks. Once you have downloaded and installed it from the download page you can start your experiments. Still it's quite a powerful and easy to use tool, which I consider to be the best available free CAD modelling tool. In fact it's a limited version of SpaceClaim Engineer. That's why when I found that DesignSpark launched free DesignSpark Mechanical modelling software I was just excited.

Unfortunately, professional CAD software is expensive. Not saying that to 3D print you just need to model it in some design software. It can save your time and resources and give you certain insights on improvements of your initial idea. It's generally a good idea in DIY(and not only DIY) projects to model your future device in 3d before start actually making something.

Designspark