.STL File / 3D model: V29

The MakeItLoud V29 got its name because it's the 29th variation I designed for this particular challenge. It is a survival whistle that is a completely original design. I designed it to be rugged, easy to make and carry, have a great design and most importantly be very loud. It is designed to be able to get you noticed in all conditions.

For ruggedness testing I spiked it into the sidewalk as hard as I could repeatedly. Then I ran it over with my car twice. Finally left it in a glass of water for 2 hours to be sure that it wouldn't sink and would drain and whistle immediately after taking it out. It still whistles.

The design is supposed to look as clean and simple as possible while still looking like a whistle. It was also designed to be easily gripped with thick gloves or cold hands. It has a raised lip on the floor and grips on the top to allow you to hold it firmly in your mouth even when you are blowing as hard as you can. There's a hole in the back for a key ring or lanyard so you can wear it around your neck or attach it to your zipper or keychain.

Another massive focus in designing this was to make it printable in one piece with no supports or rafting. I wanted someone to be able to publish this before going for a hike or something with no assembly, cleanup, or hassle of any kind to get it ready. Just print and go!

The whistle actually has two slightly different tones produced at precisely the exact same time by different chambers on either side. The two different tones alternate between amplifying and canceling each other out. This variation creates the shrill sound much like a pea whistle which is more attention grabbing and doesn't get lost as easily over background noise like one tone whistle could. Unlike a pea whistle however it doesn't jam if blown too hard and will not freeze up in cold weather. I analyzed the volume with my decibel meter and it touched 118.7db. The harder you blow into it the louder it's so someone with a more powerful lung capacity may reach louder levels. Be careful it can hurt your ears a little bit at that level.

I began printing and designing prototypes in the day this challenge posted knowing next to nothing about how whistles work. Through many hours of research and testing and constant trial and error I produced a whistle that I am very proud of. It took 29 tries but this whistle met all of the Goals I set out to attain.

For loudest effects blow as hards as you can in a burst! The international distress signal using a whistle is 3 long blasts.

I hope you publish it for yourself. Enjoy!

Print Settings

Printer Brand: MakerBot

Printer: MakerBot Replicator 2

Rafts: No

Supports: No

Resolution: .2mm layer height in version but any is fine.

Infill: 100% in version but any is fine but might effect durability.


To print with no supports print with flat top side down. I need to give a huge thanks to my good friend James who published all 29 versions for me with his printer. Thank you James!

Custom Section

Why I Designed This Whistle

As a teenager I spent many summers working as a lifeguard. 1 time while trying to rescue two people at one time I ran in to trouble. Things didn't go well and both people began pulling me under. In time another life guard jumped in to help. Another guard wasn't any where near line of sight but he heard my whistle just as I jumped in and came right away to help. I wanted to design the best whistle I could because I know from experience the demands that they face and what its like to rely on one.

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