===== General =====
There are a lot of reasons why a 3D-printed whistle might not work in some way, but generally they can be reduced to a few main tuning issues to check
  * Flow percentage issue (generally too little flow)
  * Pressure advance issue
  * bridging layers are not solid, allowing air to escape the chamber(s)

====How a whistle works====
I find it helpful to understand how a whistle works in order to troubleshoot what a possible issue is.
{{:wiki:screenshot_2026-01-25_at_21.44.56.png?400}}
==In the screenshot above, you have 3 main things happening==
  - Air enters via the airway
    - The air accelerates, usually by gradually making the airway smaller
  - Air hits the "blade", creating a fluttering effect
  - That fluttering, along with the air building up pressure in the chamber, makes the air inside the chamber vibrate, which creates sound


====So a whistle will most likely fail at====
  * The airway - too restrictive or an obstructed path not allowing air to accelerate
  * The blade - not sharp/uniform enough to create fluttering
  * The chamber - air escaping and not building pressure


===== Practical things to check =====
From the above, we should check
  * If the airway has stringing or similar in it
    * You always want to "paint on" seams away from any of the above components
  * If the blade is not sharp
    * Points to a Pressure Advance, cooling, or flow issue
  * If there are holes in the chamber walls or walls of the whistle, allowing air to escape
    * Could be flow, seam, or retraction issue