Very useful upgrade parts for series printer, you can adjust the belt freedom, more better than original. Easier to adjust belt, higher precision and better printing effect. The X-axis and Y-axis belt can be adjusted at any time by turning the screw by hand. High quality aluminum alloy material, Surface anodizing treatment. Fine workmanship, wear-resistance and corrosion-resistance.Already assembled,you don't need to assemble it by yourself,just install and adjust the timing belt to use. 2020 X-axis belt tensioner+4040Y-axis belt tensioner Compatible with Ender 3 Pro/Ender3 V2 3D Printer. After-sales guarantee: each defective item can be replacement for free or refund. If any question, please feel free to contact or QA us, BZ 3D is committed to providing you with the best service! Note:

Please select the appropriate tensioner according to your machine structure.
Great improvement for 3D Printer it makes it easy to tighten the timing belt.
Material: aluminum alloy.
The product has been assembled and can be installed directly on your printer.
Color:Black.
Surface treatment:anodizing.

Package includes:
1 X 2020 X-axis belt tensioner.
1 X 4040 Y-axis belt tensioner.