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This is upgrade extruder back support plate with 4 pulley wheels.
Compare with 3 wheels, 4 wheels is better for heavy loading, more stable, reduce vibration, as a result, improving printing quality.
suitable for Creality ender 3, ender 3 pro, CR-10, CR-10S series 3d printer.
ender 3 x carriage more stable
1 × 4 wheels back plate 2 x copper belt ring 1 x wrench