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The tally counter counts from 0 to 99 by either using the "+" and "-" buttons, or by using the included crank or house key.
The counter is designed to be easy to 3D-print, assemble and only uses household items where 3D-printing isn't viable (such as springs from pens and rubber bands).
This project has been ongoing for more than a year at this point, with five prototypes. I tried three distinct mechanisms where one got multiple iterations.
The three first mechanisms had their own set of major flaws. They were either unreliable, un-ergonomic, or prone to breaking. But the essential functions remained unchanged.
Once v4.0 was done, I felt comfortable I had a design that solved most of the problems mentioned, and I redesigned v5.0 to be more space efficient and easier to print and assemble.
Below is a video showing the prototypes of the tally counter and my thought process during the design. The animation above is also created by me to show the assembly and functions of the final counter.
You can download the files of my counter for free in this link
MECHANICAL TALLY COUNTER
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