Low-Cost Filament Spooling System

Over the course of a term, our six-member engineering team worked on a project for FAST (Free Appropriate Sustainability Technology), as part of their on-campus filament recycling initiative. FAST repurposes plastic waste from failed 3D prints into new filament. Our goal was to design a practical, affordable, and safe filament spooling system that completes the recycling workflow, supports sustainable 3D printing, and facilitates material reuse.

While FAST already had shredding and extrusion capabilities, there was no reliable system to spool the recycled filament onto standard spools. Without such a system, filament was difficult to store, handle, and reuse effectively. To address this, we designed a simple, modular, and replicable filament spooling system that integrates with existing recycling processes and enables consistent reuse of recycled material.

Students, researchers, and lab users need a safe, simple, and reliable filament spooling system that can wind recycled filament smoothly, maintain proper tension, and allow easy storage and reuse. Implementing such a system makes on-campus recycling of 3D prints more practical, reduces plastic waste, and lowers costs on new filament.

Create a safe, low-cost, and easy-to-use filament spooling system that can reliably wind recycled filament of standard diameters (1.75 mm or 3.00 mm) onto spools. This system should make it simple to store and reuse filament, reduce plastic waste, and support sustainable 3D printing on campus.

There were four main parts of the device that supported the filament spooling process:

Frame and Base:

The frame was built from cut wooden panels to provide a stable, low-cost structure. The base supports all components, reduces vibration during operation, and was sanded to improve user safety and ease of assembly.

Spool and Drive Mechanism:

A 3D-printed spool shaft holds the filament spool and allows smooth rotation. Washers, spacers, and adjustable side plates help maintain alignment, reduce wobbling, and accommodate different spool widths. Interlocking 3D-printed gears transfer motion to the spool shaft, lowering speed and increasing torque for controlled spooling.

Filament Guide:

A 3D-printed filament guide directs the filament evenly across the spool, reducing tangling and uneven winding while applying minimal friction.

Motor and Control System:

In the motorized version, a DC motor is connected to an Arduino microcontroller that controls spool rotation. The system starts at a set speed and gradually slows as the filament winds, compensating for the increasing spool diameter. An emergency stop button is included to instantly halt the system in case of extrusion issues, ensuring safe operation for any user.

The filament spooling system is simple, modular, and easy to 3D print, making it really straightforward to use. The frame, spool mechanism, filament guide, and motor work together to keep the filament winding smooth and even. That said, it still needs some manual attention, can’t handle multiple spools at once, and doesn’t automatically adjust tension. In the future, adding tension sensors, multi-spool support, interchangeable hubs, or protective covers could make it even more reliable, efficient, and versatile.