I&#x27;m with you on wearables - I&#x27;ve been trying to think of mass-market use cases for at least a year now, but I just can&#x27;t find anything that&#x27;s appealing outside of niche markets like disabilities and medical monitoring.<p>As for 3D printing, the biggest problem in my opinion is modeling, not printing itself.  The cost of stereolithography printers is finally dropping, and extrusion printers are getting easier to use, but actually printing things is useless unless you have a model you can print.  Most people just don&#x27;t want to spend the time or effort to create a model, especially when you can walk into a store and get a higher quality item that&#x27;s professionally designed and manufactured for dirt cheap.