Stepper motors vs Servo Motors vs DC Gear Motors
Has been revised to be more specific, however I don't believe this has made it more accurate. Hobby servo's are a type of servo, but despite their popularity, in the context of industrial robotics are by no means the only game in town. If hobby servo's need to be mentioned specifically, it should be in addition to their more application-suitable brother: the continuous rotation DC servo motor. Not in it's place. --JohnnyCooper
In the section:
Stepper drivers vs Stepper Controllers
It is claimed: "a very small stepper may be driven directly from the controller", wouldn't that apply solely to unidirectional stepper motors?, since a bi-directional requires a phase change.
... with a "H-bridge"-setup and 4 transistors per coil (or 8 for a bipolar motor) you can switch the coils accordingly between Vdd and GND in either direction.
But unipolar requires only one transistor per coil, so is much easier to build and control ...
Perhaps motors could be printed out of Metal deposition print head#low melting temperature metals.