I bought yellow SIMAX3D printer filament as one of the first spools I bought earlier this year when I started 3D printing. Out of everything I've bought since then, SIMAX3D filament is the best winder I've ever had, including premium filament. Many of them had to unwind a few turns once I started loading the thread. These coils do not exist. I put a photo of the spool on my printer. It is neither rigid nor brittle. I'm still new to 3D printing so I don't know which filament is good and which isn't. For me as a beginner I find it very good. Many times I've pulled my yellow SIMAX3D filament spool for a project and it has worked with no popping or feeding issues. Both print directly onto bare glass without a glue stick.
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