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The printing time and accuracy are the main problems of a 3D printer. To obtain the high accuracy of the position of the motor shaft and to solve the problem of the missing step, it is necessary to use a DC motor instead of a stepper motor. In this study a block diagram for controlling the position of the DC motor shaft with a closed loop has been proposed, and controlling the position of the DC motor shaft, using the Atmega328 microcontroller, the L293D driver and the encoder, has been executed. The use of a DC motor with a closed control system in a 3D printer eliminates the «missing step» problem, improves the accuracy and dynamic characteristics of the system, and, also reduces the noise level when operating a 3D printer.

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