The Parallax Continuous Rotation Servo is ideal for robotics and basic movement projects with a PWM-capable controller.
pigpio - Parallax continuous rotation servo only moves in one direction - Raspberry Pi Stack Exchange
Parallax Ping Mounting Bracket Kit – Electronix Express
LEARN.PARALLAX.COM
Pololu - SpringRC SM-S4303R Continuous Rotation Servo
Parallax Continuous Rotation Servo - Parallax
Parallax Continuous Rotation Servo
Pololu - Parallax (Futaba S148) Continuous Rotation Servo #900-00008
Parallax Servo, 3D CAD Model Library
R/C servo motor, continuous rotation The Parallax Continuous Rotation Servomotor is ideal for prototyping mobile (wheeled) robots. It is easily
Parallax Inc 4 → 6 V Servo Motor, 50 rpm, 27 Ncm Max Output Torque
Parallax Servo Problems - Motors, Mechanics, Power and CNC - Arduino Forum