Printed in PLA on my Ender-3. The print came out perfectly, but the whistle makes almost no noise. I print nothing but functional parts, and my printer and the designs usually agree to less than 0.05 mm, so I don't think this total failure is due to any flaw in the printer. I printed at 0.16 mm layer height.
This is my third whistle and compared to a 50 cent whistle I can get at the dollar store, all of these 3D-printed designs have been a huge disappointment.