Amazon.com: PLA-LW Filament 1.75mm, 3D Printing Filament, Lightweight, Low-Density PLA, Special for Airplane Model, 1kg Spool : Industrial & Scientific
Amazon.com: SainSmart Light Weight Filament 1.75mm, LW-PLA Low-Density Active Foaming 3D Printer Filament for RC Planes Drone Parts and Cosplay, White PLA Filament, 1KG : Industrial & Scientific
LW-PLA NATURAL
eSUN PLA-LW 3D Printer Filament 1.75mm 1KG 2.2LBS 3D Printing Filament Light Weight Foam Material for 3D Printer Aircraft Model - AliExpress