Best PET-CF Filament? I Tested 5 Brands

My Tech Fun August 10, 2025
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I tested five PET-CF filaments — BambuLab, Phaetus, Polymaker Fiberon, Qidi Tech, and Siraya — in a series of mechanical and thermal tests to see which one performs the best. The tests include layer adhesion, tensile strength, impact resistance, bending, creep, high-temperature resistance, and even corner bracket performance. I also examined the effects of drying and annealing, as well as printing performance in both closed and open printers. If you enjoy my in-depth filament testing and want to support this kind of big work, you can support me on Patreon: https://www.patreon.com/mytechfun Or just buy me a coffee: https://buymeacoffee.com/mytechfun Corner bracket you can download from Printables: https://www.printables.com/model/1379556-corner-bracket-for-2020-alu-extrusion Filament bending tool: https://www.printables.com/model/1272221-filament-bending-test Chapters: 0:00 Introduction 2:44 Tested materials 3:34 About annealing 4:05 Test objects explained 5:17 Drying 6:00 3D printing 7:15 Corner bracket bridging 7:44 Printing on open printer 8:18 Annealing 8:37 Price 8:49 Filament bending test 9:44 Layer adhesion test 10:29 Layer adhesion, open printer 11:49 Tensile test 12:32 Hook test 13:22 Creep test 14:48 Impact test 15:28 3 point bending test 16:24 Temperature test 17:21 Corner bracket test 20:34 All results 21:04 Conclusions #3DPrinting #PETCF #FilamentTest #mytechfun

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