Flexural Test Specimen - ISO 178 / ASTM D790

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Human: New shipment of carbon fiber filament has just arrived and I am curious if it is really twice as stiff as ABS. To test this claim, I have set up a simple testing rig to determine the Young's modulus of Proto Pasta's 15% short fiber pla. Results will be posted when complete. I printed a carbon fiber ISO specimen at 200C on a glass bed at 60C, and the adhesion was perfect - it didn't warp one bit. On the other hand, the regular PLA sample lifted slightly at both ends due to its high aspect ratio. Results Black PLA - 3.312 GPa Carbon Fiber PLA 5.248 GPa CF version is ~60% stiffer Proto Pasta's published value of 6.5 GPa is probably accurate given my somewhat flimsy test setup. I am confident this new filament will find a place in rep-rap designs (such as an optimized I-beam for delta bots?) and quadcopter trusses/airplane wings, but be aware that it is quite brittle - breaks suddenly with no warning. Instructions: I'm printing 3mm filament using a .5mm nozzle. Layer thickness: 0.4mm 10 layers in total 5 perimeter walls 100% solid rectilinear fill (yes, slow!) Delamination isn't my primary concern this time around.