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Well, if Servo Writer is a robot, then so's WhizzyWriter. Here's the motor. This was the X-axis motor from a printer (the one which pulls the print head across the paper). I have attached a disc of white plastic to it as the reflector for the optical position sensor. This is an aluminuim U section mounted to the motor. Two screws were screwed into section, one on either side of the motor shaft to fix it in position. Note the black line drawn on the "reflector" and the multicoloured wires ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/whizzywriter