I went through almost a dozen revisions, and I could not get any print to whistle. I learned that if air cannot flow into the cavity, there is no sound, and my design was choking off the flow from entering the base. I can make it larger to accommodate the design, but that would defeat the purpose of a micro whistle.
I made a working CylinderWhistle! They print upright, so they do not take up much space on a printer bed. Unfortunately, they were not as loud as I hoped. These whistles were perfect for cases where someone wants to print many whistles, but they cannot attend to their printer often. A lot of these can fit on a print bed, but they take a while to finish.
The biggest problem with the CylinderWhistle was the curved overhangs that drooped when I printed them. I changed the model to have four or six flat sides so they should have greater fidelity when I print them.
I ordered and measured a generic handcuff key so I could build a whistle around it. The device will have a functional whistle and a hidden key, but I can swing it out if necessary, and the whistle becomes the key handle.
I went through seven revisions before I made a model that whistled and held the key correctly. There were issues with undersized chambers, thin walls, and unusable whistle geometry. Once I had something that worked, I was very happy with the outcome.
We talked about I'm Your Man for the second week of Human-Machine-Love February. Last week, we talked about Her, and the two movies were identical at the core, but the flavor they showed on the screen could not have been more different. We recommend I'm Your Man.
The rest of the summary posts have been arranged by date.
First time here?
Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8
Completed projects from year 9
Completed projects from year 10
Completed projects from year 11
Completed projects from year 12
Disclaimer for http://24hourengineer.blogspot.com and 24HourEngineer.com
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information on this blog, or linked by this blog, is not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property, or similar, is the responsibility of those involved in the replication.
All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.
Comments to the blog may be utilized or erased at the discretion of the owner. No one posting may claim property or assets based on their post.
This blog, including pictures and text, is copyright to Brian McEvoy.
![]() |
| Non-functional REVs |
I made a working CylinderWhistle! They print upright, so they do not take up much space on a printer bed. Unfortunately, they were not as loud as I hoped. These whistles were perfect for cases where someone wants to print many whistles, but they cannot attend to their printer often. A lot of these can fit on a print bed, but they take a while to finish.
![]() |
| REV13 whistle: noisy and takes minimal printer bed space |
The biggest problem with the CylinderWhistle was the curved overhangs that drooped when I printed them. I changed the model to have four or six flat sides so they should have greater fidelity when I print them.
![]() |
| Low-poly whistles |
I ordered and measured a generic handcuff key so I could build a whistle around it. The device will have a functional whistle and a hidden key, but I can swing it out if necessary, and the whistle becomes the key handle.
![]() |
| Generic handcuff key diagram |
I went through seven revisions before I made a model that whistled and held the key correctly. There were issues with undersized chambers, thin walls, and unusable whistle geometry. Once I had something that worked, I was very happy with the outcome.
![]() |
| Working whistles and hidden handcuff key |
We talked about I'm Your Man for the second week of Human-Machine-Love February. Last week, we talked about Her, and the two movies were identical at the core, but the flavor they showed on the screen could not have been more different. We recommend I'm Your Man.
Critical Affection: I'm Your Man (1:20)
The rest of the summary posts have been arranged by date.
First time here?
Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8
Completed projects from year 9
Completed projects from year 10
Completed projects from year 11
Completed projects from year 12
Disclaimer for http://24hourengineer.blogspot.com and 24HourEngineer.com
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information on this blog, or linked by this blog, is not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property, or similar, is the responsibility of those involved in the replication.
All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.
Comments to the blog may be utilized or erased at the discretion of the owner. No one posting may claim property or assets based on their post.
This blog, including pictures and text, is copyright to Brian McEvoy.





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