Automatic Electric 3D Printer Filament Rewinder with Speed Control

### Intelligent Auto Start/Stop The sensor triggers the motor automatically when filament is detected, pausing when the material runs out, for hands-free operation. ### Adjustable Speed Control The winding speed can be freely adjusted from slow to fast to match different filament types and spool sizes. ### Precision Synchronous Belt & Gear Drive Combined synchronous belt and gear system ensures smooth, consistent winding without slippage or tangled filament. ### Universal Compatibility Works with most standard 1.75mm/3mm filaments (PLA, PETG, ABS, etc.) and fits common filament spool sizes. ### Knot-Free & Neat Winding The automated process ensures even, tidy filament layering, preventing knots and waste during re-spooling.