Make a 3D printed pirate at home with cardboard - 3Dnatives
My cardboard ender enclosure. 5mm thick, works beautifully, $0. : r/ender3
3D Printable CardBoard Robot - Fold Out Print In Place Robot! by Harry Roper
Creality Hpyer PLA 3D Printer Filament 1.75mm, 1kg Cardboard Spool (2.2lbs), Designed for High Speed Printing, Dimensional Accuracy +/- 0.03 mm, Fits Most FDM Printers (White) : Amazon.co.uk: Home & Kitchen
Quick and Dirty 3D Printer Enclosure. : 5 Steps - Instructables