General
This is your new workout device: 2, 3 or 4 clicks every day, and you are done!
Choise of 4 languages: English, French, German and Dutch.
Any order of the rings can be chosen.
A wide and small blank ring is added for use with 10 stickers of your own.
Designed in Tinkercad.
Dimensions: 98 x 52 x 57 mm.
Weight: 0.09 kg.

Scaling
Scaling down is possible to 80% (tested).
At 80% the rings run a bit tightly. For a really smooth operation, the rings (not the other parts!) should be scaled down to 81% over the X- and Y-axis, and 80% over the Z-axis.

Printing
I printed the model on a Prusa MINI, with PLA+ filament, layer height 0.15 mm.
Slicing in PrusaSlicer.
Avoid elephant foot and over-extrusion.
Carefully remove the support material from the cores (A2, A4, A6, A8). Make sure both tongues of the cores can move freely.

Assembly
Assembly in alphabetical order (A1 → A10).
The calendar is glued together. I use Hard Plastic Glue.
The rings can be assembled in any order.
For assembled and exploded views, use .stl files 0… 01…(do not print).


Operation
The rings turn uni-directional.

I am very curious about the color scheme of your print.
Happy printing!