0-99 Counter with Automatic Tens Advance

Update on 21/05/2026:

Here is a 0 to 99 Counter (for HP or other uses 😁)

The tens digit automatically advances thanks to a Geneva drive

Fully reversible : can count up and down

As suggested by Hoxting, the new design reverses the axis position! They are now on the lid to have completely smooth faces (Thanks to you 😉)

For assembly, it is done in 4 steps, the new program generates a random joint line, it is no longer necessary to sand the 3 axes:

• assemble the 2 gears with the Units and Tens Wheels (glue can be used but is not mandatory)

*For the Units Wheel (in red on the right) make sure to place the 9 above the rectangle as shown in the image below

• place the Gears in the Lid with the 0s in the window as shown below

• place the 3rd Gear on the last axis of the lid positioning the finger at the bottom

  

• close with the Case by gently forcing it to clip

  

The flat front and back surfaces are customizable with text in BambuStudio in Modifier mode 😊

If you have any comments or ideas / needs, let me know in the comments!

Have a good game!