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[Reply #30 on:]

Below are two inexpensive servos you could use for initial testing. Metal geared servos would probably have less flex and gear slop than the plastic based ones. If you are expecting to make a simple plotter using hobby servos that write characters within a 7mm spacing, it will probably be much more difficult than you realize.

http://www.hobbypartz.com/kahaoubrmo14.html
http://www.hobbypartz.com/topromisesg9.html