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Amazon.com: SUNLU 3D Pen Filament Refills, 10 Bright Rainbow Colors, Total 164 Feet (50 Meters), Each Color 16.4 Feet (5 Meters), PLA Filament 1.75mm for Most 3D Doodler Pen, Easy to Use,
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MYNT3D Super 3D Pen for Kids and Adults, 1.75mm ABS and PLA Compatible 3D Printing Pen - Walmart.com
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