I thought the handcuff key holder/whistle would be a quick modeling job and then I would have a working piece I could stick in my pocket. I was annoyed to have seven failed revisions before I got everything working. In the early models, I left the top bare so I could install a key and fasten the lid with an M3 bolt, but the whistle did not work. I expanded the cavities, thickened the walls, and added the lid before I got sound out of it. In later iterations, I added a protrusion to enlarge the left cavity and break up the symmetry. I also experimented with two-color prints for a two-tone look.
On REV08, I designed a whistle that worked and a key holder that functioned correctly! The white key cover can rotate, which is a bug, not a feature. If the rotation becomes a problem, I will glue it. I was delighted with how nice this looks. The black-and-white gives a yin-yang vibe, but that was unintentional.
The rest of the posts for this project have been arranged by date.
GitHub repo for HandcuffKey24.
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.
2026-02-04
 |
| Early revisions |
On REV08, I designed a whistle that worked and a key holder that functioned correctly! The white key cover can rotate, which is a bug, not a feature. If the rotation becomes a problem, I will glue it. I was delighted with how nice this looks. The black-and-white gives a yin-yang vibe, but that was unintentional.
 |
| Working whistles and hidden handcuff key |
The rest of the posts for this project have been arranged by date.
GitHub repo for HandcuffKey24.
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.
2026-02-04
Comments
Post a Comment