Why microstepping in stepper motors isn't as good as you think - EDN
What is a Stepper Motor? | All About Stepper Motors | Adafruit Learning System
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E3D Stepper Motors
Amazon.com: Twotrees Stepper Motor Nema 17 Motor High Torque 1.5A (17HS4401) 42N.cm (60oz.in) 1.8 Degree 38MM 4-Lead with 1m Cable and Connector for 3D Printer : Industrial & Scientific
Moons'motor Stepper motors
1.5V, 3V, 6V DC High Torque Small Stepper Motor | NFPshop.com