Track for HexBug nano. Platform - http://www.thingiverse.com/thing:2106431 Track turn - http://www.thingiverse.com/thing:2138143 Walls - http://www.thingiverse.com/thing:2110222 Posts (for floors) - http://www.thingiverse.com/thing:2110262

Try to scale object up to 10000%. Yes. The size is also an issue for me, it happens sometimes when I export from sketchup objects. When I open stl in cura, I get message - "Auto scaled to 10000% of original size" and then it is like it should be.