How Much STRONGER is Carbon Fiber Filament? And is it better?

Published on June 2, 2021
Duration: 12:28

Hoffman Tactical provides an in-depth analysis of carbon fiber (CF) PETG filament for 3D printing, comparing its strength and properties to standard PETG and PLA. The expert assessment highlights that while CF PETG offers increased stiffness and a 25% tensile strength improvement horizontally, it also becomes more brittle. For applications like firearm lower receivers, the recommendation leans towards non-filled plastics such as PLA+ or 3D870 PLA due to their better balance of strength, durability, and heat resistance. Printing with CF filament necessitates a hardened steel nozzle.

Quick Summary

Carbon Fiber (CF) PETG offers about 25% higher horizontal tensile strength than standard PETG and features improved aesthetics like a matte finish and reduced curling. However, it is more brittle. Printing requires a hardened steel nozzle. For structural parts like firearm lower receivers, PLA+ or 3D870 PLA are often recommended for better impact resistance and heat deflection, despite lower tensile strength.

Chapters

  1. 00:00Introduction to Carbon Fiber Filament Testing
  2. 01:08Printing Requirements and Aesthetics
  3. 03:17Tensile Testing Methodology
  4. 05:33Strength Results: CF vs. Plain PETG
  5. 07:24Strength vs. Durability in Tactical Parts
  6. 11:15Final Recommendations for Lower Receivers

Frequently Asked Questions

How much stronger is Carbon Fiber PETG compared to regular PETG?

Carbon Fiber (CF) PETG demonstrates approximately 25% greater tensile strength in horizontal tests compared to standard PETG. However, this increase in stiffness comes with reduced ductility, making CF PETG more brittle and prone to sudden failure, similar to PLA.

What are the printing considerations for Carbon Fiber PETG filament?

Printing with Carbon Fiber PETG requires a hardened steel nozzle due to its abrasive nature, which can quickly wear down standard brass nozzles. It also offers aesthetic benefits like a matte finish and reduced curling on overhangs compared to plain PETG.

Is Carbon Fiber PETG suitable for 3D printing firearm lower receivers?

While CF PETG offers increased stiffness, its brittleness makes it less ideal for structural components like firearm lower receivers. Experts recommend materials like PLA+ or 3D870 PLA for their better balance of strength, impact resistance, and heat deflection.

What is the difference in layer adhesion between CF PETG and regular PETG?

The increase in vertical layer adhesion when using Carbon Fiber PETG is relatively modest, approximately 10% stronger compared to standard PETG. This suggests that while horizontal strength is significantly boosted, the bond between layers sees a less dramatic improvement.

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