Tenterfield style fox call whistle

A 3D printable classic Tenterfield style fox caller whistle. Based on home made versions commonly made from tin plate or similar metals.
Blown a similar way as a person wolf whistles with two fingers. The small hole up, larger hole down, tongue placed across the fold...

If the holes print out rough then clean the small hole with approx 2.5mm drill bit and the large with approx 4mm drill bit. Hole size can be varied a little as can the 'plate' thickness.
This is still a work in progress...