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A few things to consider with this project: 1) The motor is too fast - a stepper with a gear reduction would be a better choice 2) The motor is heavy - will probably move the motor to the mounting end of the main arm and use a belt or wire drive to actuate the folding arm.   I've been taking apart some old printers looking for appropriate gear components.  A nylon worm gear 1:100 would be perfect. ...