Elderly people can have a hard time to wind up their watches. Therefore, I constructed a simple aid, that you can press onto the crown, then wind the watch with ease. I made a set with varying inner diameters, as it is a sort print-and-go thing.
print (prusa i3mk3): 20min
For use, Flex98 turned out to work better than more flexible materials such as ninja- or filaflex.
The item was constructed using freecad. However, the construction is only a set of booleans between solids, there is no use in publishing it.