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speed on rotarys is RPM of the motor, nevermind is fast , but don have torque, the needles cannot be push strong, specially for pushing CARTS u need lot of toruqe on motor

HEY GUYS, the WATT is not the main issue of the POWER of a motor, the most important is a TORQUE, can push CARTS much better a 2 watt HIGH TORQUE motor than the 4.5 watt expencive MAXON

the stupid...