Use this tutorial to create your own whistle with this tutorial in less than 1 hour. The original lesson can be found on Instructables.
Create a cylinder of 20 mm diameter x 7.5 mm height.
Create a hollow cylinder of 17 mm diameter x 8.5 mm height. Height does not matter, but the diameter will give you a 3 mm wall. It is important to lift 1.5 mm from the workplane.
Align both cylinders on the X axis and on the Y axis. Not on the Z axis. Group it.
Make a rectangle of 24 x 7 x 7.5 mm.
Align the cube with the cylinder, on the Y axis.
Move the prism with the arrows on the keyboard and put tangent to the cylinder.
Group cylinder, hollow cylinder and prism.
Create a hollow cube of dimensions 24 x 7.5 x 2 mm. Raise it 3.75mm from the workplane.
Align hollow prism tangent with whistle. It may be necessary to adjust the grid to 0.1mm.
Rotate -22.5º the hollow prism you have doubled before.
Put that hollow prism tangent to the hollow interior of the whistle. It may be necessary to adjust the grid to 0.1mm.
Create a hollow prism of 24 x 3 x 7.5 mm, raised 3.75mm from the workplane.
Group all and you have one half of the whistle.
Duplicate it to get the other half of the whistle.
Invert the duplicated half using the Mirror tool or by pressing ‘M’ key.
Mount one half on the other by raising it 7.5 mm and group it.
Step 22 Group it
Step 23 Create a Keyring
Create a 12x12x mm toroid raised 1.5mm from the workplane
Step 24 Align Toroid and Whistle
Align the toroid with the whistle on the Y axis and on the Z axis. Not on the X axis.
Step 25 Cut the Toroid
Remove half of the toroid you do not want with a hollow cube.
Step 26 Place Toroid in Whistle
Place that half of the toroid to the body of the whistle. Check that nothing protrudes from the toroid inside.
Step 27 Group It
Step 28 Whistle Insert
You can print a small ball or use a small chickpea
Print this with support material: https://learn-dhf-website.s3.amazonaws.com/Whistleball.stl
Print the whistle half-way > Pause Print and place the ball inside> Continue Printing