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How Fil3D filament is made: precision from bead to spool

How Fil3D filament is made: precision from bead to spool

How Fil3D filament is made: precision from the bead to the spool

Introduction


The filament is the “ink” of 3D printing. But unlike paint, it requires constant dimensional quality and rigorous physicochemical properties. At Fil3D, filament production is carried out with absolute control, guaranteeing not only the stability of the material during printing, but also the fidelity of the final result.

Phases of the Fil3D filament manufacturing process

1. Selection of raw material

  • We use high quality technical polymers: PLA, PETG, ABS, TPU, among others.

  • The granules are certified, with full traceability to the supplier.

  • Each batch is tested before shipping. extrusion.

2. Drying the raw material

  • Moisture is the biggest enemy of extrusion: it causes bubbles, variations in diameter and fragility.

  • Each type of polymer is dried at a specific temperature and time (e.g. PLA at 55°C for 8 hours, PETG at 70°C for 6 hours).

  • We use industrial greenhouses with active dehumidification and digital monitoring.

3. Extrusion

  • The dried granules feed into a single screw extruder, where they are melted and mixed.

  • The melt is pushed through a calibrated die (1.75 mm or 2.85 mm).

  • The temperature, pressure and speed are constantly adjusted by PID sensors.

  • The extrusion zone is completely closed to avoid contamination and thermal fluctuations.

4. Cooling and stabilization

  • The filament goes through two temperature-controlled water bath stages (typically 25°C and 15°C).

  • The first stabilizes the shape, the second locks the final dimension.

5. Measurement and dimensional control

  • We use double-axis laser sensors, with an accuracy of ±0.002 mm.

  • Any deviation activates automatic correction of the traction speed.

6. Winding

  • The filament is wound on spools by torque-controlled motors, ensuring constant tension.

  • Prevents tangling and overlapping turns.

  • Each spool undergoes a final visual inspection.

7. Packaging

  • The reels are vacuum sealed with desiccant silica.

  • We include label with batch, date, type of polymer, color and tolerance.

8. Laboratory and testing

  • Samples are taken from each production for testing:

    • Fluidity tests (MFI)

    • Tension

    • Adhesion between layers (printed)

    • Diameter (micrometric and optical)

    • Compatibility with commercial extruders

Practical example: impact of dimensional accuracy

In a batch of Fil3D PETG intended for the production of technical parts for medical devices, the diameter variation was less than ±0.015 mm. This allowed the uninterrupted printing of more than 200 parts, with tolerance margins of just 0.2 mm — something that would not have been possible with inconsistent filament.

Fil2ndLife – recycled filament with the same control

  • The same process is applied to the filaments of the recycled line.

  • We use certified post-industrial materials.

  • We guarantee dimensional consistency and a finish equal to virgin ones, with complete traceability.

Conclusion

The quality of the filament begins in the detail. And at Fil3D, every detail counts: from the bead to the tip of your nozzle.
Therefore, each coil we deliver is the result of a tested, documented and technically controlled manufacturing process.

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