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Very usful upgrade parts for series printer, you can adjust the belt freedom, more better than original. Material: aluminum alloy; Please Note: Don't fit for Ender 3 Pro. Surface Treatment: anodizing. Name: 2020 aluminum profile X-axis belt stretch. Comes with parts, you need to assemble and install it by yourself, How to install: reference video on Youtube, please search keywords: FYSETC Ender 3 X axis Belt Tensioner.Package includes: 1 Kit X-axis belt stretchs




