Nice - I notice that the paper wobbles substantially when the needle strikes it. Hav you considered sandwiching it between two plastic plates (with channels cut for the needle) to hold it flat and still?
There was a little plastic plate but it made the action of putting the paper in very tricky.. So I ended up taking it away! I think I am going to do a magnetic holding plate for the next version to be able to take it away and put it back easily.
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