ANYCUBIC KOBRA 2 PRO Belt Grinding

Y-Axis Stepper Motor Pulley

The 'grinding' noise is typically the result of the stepper motor's D-shaft spinning inside the drive pulley bore because the set screw (grub screw) has loosened. This creates metal-on-metal abrasion and prevents the belt from translating torque into bed movement. Replacing the pulley or its mounting hardware ensures a positive mechanical lock between the motor and the motion system.

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Y-Axis Stepper Motor Cable

The Y-axis cable is subject to high-frequency vibrations and rapid movements which can cause the connector pins to back out or develop internal fractures. An intermittent loss of one motor phase causes the stepper to stall rather than rotate; this electrical stall creates a loud mechanical vibration that sounds identical to grinding gears.

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Y-Axis GT2 Timing Belt

If the belt tension is too low, the fiberglass-reinforced teeth can 'jump' or 'cog' over the pulley teeth during high-speed directional changes. This rapid skipping causes physical wear on the belt profile and produces a harsh grinding sound as the belt teeth are shorn against the pulley flanges.

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