How Does One Obtain a Sponsorship For a Project?

I have noticed that many users here obtain sponsorships from companies for the projects on which they work, which seems to be very useful when one is working on a project that may become very expensive.

Therefore, I am wondering: how does one obtain a sponsorship for a project? I currently am not working on any projects, but if I do so in the future, it would be nice to know how one can obtain sponsorship. I would greatly appreciate any feedback on this subject.

If you use the search feature, there are numerous other threads with information on this. Lots of good information too.