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Brittle Filaments: Simplified 3D Printing Guide for Carbon Fiber and Glass Fiber Brittle Filaments
2026-01-08
I. Explanation of Filament Brittleness
Filament brittleness is determined by polymer composition and fiber content. Fiber-reinforced models such as ERYONE-ASA-GF and ABS-GF are slightly brittle. Storage conditions, manufacturing processes, and dehydration caused by long-term vacuum sealing can also increase brittleness.
II. Key Preparation Points for Brittle Filaments
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Dry the material in a filament dryer or oven at the recommended temperature for several hours before printing to remove moisture, improve interlayer adhesion, and reduce breakage.
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For spools that have been vacuum-sealed and stored for a long time, cut off the outer 20 grams (prone to embrittlement due to long-term stress or dehydration).
III. Optimization of Filament Feeding Path
1. Brittle filaments are not suitable for multi-path feeding systems such as AMS. Ensure the path to the extruder is straight and unobstructed, avoiding sharp bends and kinks; prefer direct feeding from the spool without using overly long PTFE tubes.
2. Remove the PTFE tube if necessary.
IV. Extruder Selection and Adaptation
Prioritize direct-drive extruders with low torsion and stable tension to avoid filament bending and breakage caused by excessive torque during feeding; ensure uniform tension during feeding to reduce filament stress deformation.
V. Core Printing Recommendations
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Use hardened steel or ruby-tipped nozzles to handle fiber abrasion and avoid excessive nozzle wear. (Prefer 0.6mm nozzles or new 0.4mm hardened steel nozzles)
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Properly increase the temperature within the recommended range, approximately 10℃ higher than the printing parameters of ordinary base materials, to improve fluidity and interlayer adhesion.
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Reduce the printing speed by 25%-50% to ensure stable extrusion.
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Prioritize direct-drive extruders to ensure controllable feeding; control moisture throughout the process and keep the filament dry continuously.
With proper material handling and path optimization, even highly brittle engineering-grade filaments can be fed stably, producing high-strength and dimensionally stable parts.
VI. Summary of Core Points
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CF/GF filaments: High rigidity, stable dimensions but relatively brittle, requiring careful handling.
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Factors affecting brittleness: Polymer composition, fiber content, storage conditions, long-term vacuum sealing.
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Brittleness reduction measures: Thoroughly dry, cut off the first 20 grams of aged/dehydrated material.
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Path requirements: Straight and low friction, no sharp bends, avoid complex feeding systems.
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Printing parameters: Hardened steel/ruby-tipped nozzles, proper temperature increase, 25%-50% speed reduction; prefer 0.6mm nozzles or new 0.4mm hardened steel nozzles.
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Storage key points: Proper drying and storage to ensure printing reliability and part durability.