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Amazon.com: SUNLU PLA 3D Printer Filament Neat Spool, PLA Filament 1.75mm Dimensional Accuracy +/- 0.02mm, 1kg(2.2lbs), Reusable MasterSpool, White : Industrial & Scientific
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Reprap development and further adventures in DIY 3D printing: MasterSpool - A proposed standard for 3D Printing filament supply without a spool
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