Features: Accurate Weighting Machine: Weighing precisely and showing the remaining filament weight, and you can compare it with the needed weight of filament estimated by slicing software, to determine whether the remaining filament is enough for model printing to avoid insufficient printing filament situation. Large-diameter Roller Design: It fits better with the filament spool, reducing the large shaking of the filament and helping the printer run smoothly. Easy to Operate & Long-lasting Power: Comes with rack accessory to install, suitable for all FDM 3D Printer. Built-in 200mAh rechargeable battery, long-term energy storage, stable performance, standby for 3-6 months with one charge. Smooth Feeding: The spool rack has built-in bearings to reduce the feeding resistance of the extruder, making the feeding smoother and reducing roller wear. HD Display: It uses a high-brightness digital tube display to display the weight, and the overall appearance is simple and elegant. One-button touch operation, concise interface. Specification: Model Name: Digital Spool Rack-S (Single) For: All FDM 3D Printers Color: Black Capacity: 2kg Precision: ±5g Charging Voltage: 5V Battery: 200mAh Product Size: 52x52x122mm Package Size: 150x70x70mm/5.9x2.7x2.7in Package Weight: 280g/9.8oz Packing List: 1 x Digital Spool Rack-S (Single) 1 x Rack