Telescoping Tube Whistle

Inspired by "Amplifier" (http://www.thingiverse.com/thing:1016045), I took one of my Tube Whistle designs (http://www.thingiverse.com/thing:1025843), and incorporated a telescoping amplifier cone; this is the result.

A couple of the pictures are of a first revision (that failed to print successfully), and only has two telescoping rings.

The first published .stl file, save_19_4_rings.stl has four telescoping rings to extend the amplifying cone.

At the moment, my printer is not working (t