Ball-Bearing Yo-Yo with Kit
Print a butterfly style yo-yo with ball bearings.
You will need a yo-yo kit for the internals available here:http://www.leevalley.com/US/wood/page.aspx?p=49920&cat=1,250,43243,50237
See my blog for more info: http://samueldperry.com/2015/04/04/3d-printed-yoyo/