3D printing is great, but things can go wrong. Sometimes, if your settings are wrong, or if the filament doesn't cooperate, or if the model is just fussy, you can end up with a plate of silent whistles. To ensure some amount of QA is done, make sure to test at least one whistle from each plate you produce.

For around USD$30, you can get a handheld compressed-air duster that charges via USB.

Amazon Link: https://www.amazon.com/dp/B0CFQC4DB3

You can use this to test whistles that come off the plate, and the best part is, you don't need to toss them afterwards.

Some volunteers use handheld vacuums to do the same thing.

You can use a baby nasal aspirator to test whistles. These are usually USD$1-USD$3 at many stores.

If you don't have any mechanical way to test whistles, you can do so the “old fashioned” way. Just give one a toot! After you confirm the whistle makes noise THROW IT AWAY, no one wants a pre-used whistle.