High-performance filaments like PET-CF, PPA-CF, and PPA-CF Core unlock incredible possibilities for strong, durable 3D prints. However, working with these advanced materials requires specific handling, especially regarding moisture control. That's why using a dry box during printing is essential.
Core-shell (or "fiber-core") filaments have revolutionized FDM 3D printing by balancing strength, stability, and nozzle longevity. At Siraya Tech, our PPA-CF Core and ABS-CF Core filaments use this advanced architecture to maximize performance while reducing common issues like nozzle abrasion.
However, to fully benefit from these materials, proper hardware compatibility is essential—and that’s why these filaments are not compatible with CHT nozzles.
What Are Core-Shell Filaments?
Core-shell filament technology strategically embeds carbon fiber reinforcement in the core of the filament, while the outer shell remains pure thermoplastic (e.g., PPA or ABS). This offers several key benefits:
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Improved nozzle life: Since the outer shell is fiber-free, contact with abrasive fibers is reduced.
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Superior layer bonding: The pure shell enhances inter-layer adhesion and Z-axis strength.
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Stable extrusion: Reduced surface friction makes for smoother printing.
Why Core-Shell Filaments Are Not Compatible with CHT-type Nozzles
CHT (Core Heating Technology) nozzles, often made for high-flow applications, feature multiple bores and internal turbulence to melt filament faster. While effective for homogeneous materials, this design creates problems with core-shell filaments:
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Fiber Core Disruption: CHT nozzles shear and redistribute the fiber-rich core, breaking the internal architecture and reducing strength.
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Poor Extrusion Quality: The mixing and turbulence in CHT nozzles negate the core-shell benefits and can result in uneven flow and inconsistent prints.
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Increased Clogging Risk: Fiber clusters may clog the narrow, multi-channel paths of CHT nozzles.
In short, using CHT nozzles defeats the core-shell design purpose and may significantly compromise your final part’s quality and performance.
Check out the comparison test video of PPA-CF and PPA-CF Core from My Tech Fun
✅ Recommended Nozzle Types for Core-Shell Filaments
To fully take advantage of Siraya Tech’s fiber-core materials, we recommend:
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High-quality hardened steel or ruby nozzles
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Standard single-hole nozzles with smooth flow paths
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Nozzle sizes between 0.4mm and 0.6mm for best performance
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Direct drive extruders (optional, but ideal for stable extrusion)
Avoid experimental nozzles with internal channeling (e.g., CHT) or soft brass when printing abrasive filaments.
🛒Where to Get Core-Shell Filaments
Siraya Tech’s advanced core-shell filaments are available now:
⚙ Files for PPA-CF Core and ABS-CF Core Filament
📥 Download print settings:
📄 Material Datasheets (TDS):