Last year we wrote about Innocentive, where you can get rewarded for coming up with solutions for business, social, policy, scientific, and technical challenges (see that entry here).  In the past they’ve had a few 3D printing related challenges and now they have another one where you can earn $7,000 in exchange for ideas on how to 3D print with cotton.  The problem is open until February 23, 2014, so get those ideas in now!