Wankel Rotary Engine

I was having some trouble with the assembly of the this engine http://www.thingiverse.com/thing:536050 Mostly because I had to resize the pieces so they fit in my printer.

I notice that the gear were not working in the model an there was a lot of glue involve. So I redesign the core, the axis and the crank so that they don`t need to be glue.