trumpet.ZIP (compressed bugle)

Years ago, I designed a 120 cm Bugle for 3D printing and It works very well. Now I have made the same bugle but folded over itself, and it works just as well.
It has five sections, and each section has exactly the same diameters and volumes as the stretched version, except that the tubes are folded inside others.
https://www.thingiverse.com/thing:5243386