rog8811
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googled for such projects, and discovered that vibrating motors from cell phones are even smaller and only 1,50 euro each.
compact design coming up!
I would be interestred to see a yet smaller one , just a little word of caution. If I remember correctly my mirrors were around 10mm dia and if you look at the photo,s you will see that you need to hit the first one off centre to get a good spiro image, that makes keeping the whole image on the second mirror a work of art. The first one I built I got it right first time, the second one took me ages to get it right.
Best of luck with it and post pictures when you are done
Regards rog8811