Mechanical Binary Counter (Moduler) by outlawsMakaveli
Step files and video on (Consider downloading here):
https://www.printables.com/model/595782-mechanical-binary-counter-moduler
Fully mechanical binary counter. It's moduler so you can extend to whatever digit you want.
In order to make a one “component”, you need
zero_side x1
one_side x1
Zero x1
One x1
carry_piece x2
mid-left-right base (depends on where) x1
connector or handle connector x1
Then you can add them together and finish the build with handle. I'm leaving this assamble so everybody can play around with.
Print Instructions
No need support for any of these files.
Careful with fitting parts. I tried bunch of times and this tolerance seems more reliable. Make larger the holes which you will insert the Zero and One with diamond files or something if it necessary. Also the elephants foot makes things harder for bases. Try to minimize it.