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.