I love pocket watchs. They represent other age where measuring the time in your pocket was something important... and elegant. That's why I decided to create this pocket watch using a modern watch.
Many cheap smartwatchs today are a watch sphere that can be removed for a rubber band to be interchangeable.
That's the case of the my "ihealth wave watch" A relative cheap sport watch that I'm not using anymore.
I created an small accessory to transform the wrist watch in a modern pocket watch.
You have two versions. 21 mm outside diameter and 20 mm outside diameter.
You can also have the Freecad file to create your own version.
Breaking the weak point
The designs have a little break point at the bottom of the ring to allow the sphere to enter and be removed from the ring.
Depending of your 3D printer and calibration this break point will be easy to break (just do a litlle force) or hard. If it's hard, cut the break point using some scissor.