Sunlu PPA-CF: The Stiffest Filament You Cannot Buy

My Tech Fun has published a review of Sunlu PPA-CF filament, calling it "the stiffest filament you cannot buy" due to its limited availability outside China. ## What is PPA-CF? PPA (Polyphthalamide) is a high-performance semi-aromatic polyamide with better thermal and mechanical properties than standard PA (nylon). Combined with carbon fiber, it offers: - Extreme stiffness - High heat resistance - Excellent dimensional stability - Low warpage ## The Review Findings The reviewer found: - Exceptional stiffness — parts feel rigid, not flexible - Good layer adhesion with proper settings - Requires hardened nozzle (carbon fiber is abrasive) - Higher print temperature than standard filaments ## The Catch Availability is extremely limited outside China, making this more of a preview of what is coming than a filament you can buy today. ## Why It Matters As filament manufacturers push into higher-performance materials, we are seeing the gap between industrial and desktop filaments narrow. PPA-CF represents the next tier beyond CF-Nylon. **Source:** My Tech Fun