Hot Wheels to Duplo - Curve Mount
Attaches to the back of the track curve via ball mount, adjust height with Duplo blocks. Updated with larger ball for tighter fit.
Can be mounted to ball mount parts.
http://www.thingiverse.com/thing:857708
http://www.thingiverse.com/thing:857690
http://www.thingiverse.com/thing:581762
No curved track file yet.