Bambu Lab Y-Axis Tensioner – A1 mini is a metal component used to tension the Y-axis belt of the A1 mini 3D printer, ensuring optimal belt tension for accurate and reliable Y-axis movement. Made of silver-colored metal, it weighs 0.05 kg and measures 60×60×30 mm, with an integrated accelerometer that monitors belt tension force and alerts the system if adjustments are needed.