Amazon.com: Lightweight Foamed PLA-fp 3D Printer Filament (0.54g/cm³) Special Material for Aircraft Model 1.75mm +/-0.02mm 1kg Spool (2.2lbs) Matte Surface,Black : Industrial & Scientific
Polymaker LW PLA Filament 1.75mm Gray, Pre-Foamed PLA 800g Lightweight 3D - 3D | | eBay