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Yes I have considered using motors, but I decided I did not want that. Because my goal was to make the design as simple as possible. And with that I mean, easy printable without supports, and ready to use after printing it. Motors would mean you have to buy a motor and install it etc. I also think a motor decreases the "play value" on the long run.
But then again, motors are awesome too ;)

And in the video you can see my hand (finger) which should be enough for scale, I figured ;)
But thanks for the tips, I appreciate it!