This device recycles plastic water bottles into 3D printing filament (and it's open source) | ZDNET
Amazon.com: HATCHBOX 1.75mm Black PLA 3D Printer Filament, 1 KG Spool, Dimensional Accuracy +/- 0.03 mm, 3D Printing Filament : Industrial & Scientific
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Dremel 3D Printer PLA Filament 10-Pack
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3D Filament PLA Optional 1.75mm 1KG plastic Rubber Consumables Material a variety of colours filament 3d printer Filament
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BASF Ultrafuse 316L Metal 3D Printing Filament - 1.75mm (3kg) | MatterHackers
High Quality 3d HIPS filament 1.75mm 1kg 3d printer filament 1 KG HIPS 3d plastic filament Low cost, less odor than ABS xp pen - AliExpress
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MatterHackers MH Build Series - black - PLA filament - MY6CYEZM - Printer Accessories - CDW.com
Amazon.com: 1.75mm 22 Mixed Colors 3D Printing PLA Filament Sample Refill Pack, Each Color 10ft, Total 220ft PLA Refills, Fit for Most 3D Printer & Normal 3D Pen, with Extra 2 Silicone