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Re:Recycle Cardboard into Anything with 3D Printing [video] by jakogut on Sunday April 07, 2024 @02:32PM (#39962706)
I've been getting into compression molding composites and remembered seeing this video some time ago that's relevant.

Wood pulp from paper products can be recycled using a blender, binder, and very similar compression molding techniques.

Re:Recycle Cardboard into Anything with 3D Printing [video] by helph67 on Sunday April 07, 2024 @05:37PM (#39964179)
Papier-mâché has been used to produce variety of objects including some able to be used regularly for years e.g. food trays. https://en.wikipedia.org/wiki/Papier-m%C3%A2ch%C3%A9
Re:Recycle Cardboard into Anything with 3D Printing [video] by biggedyb on Sunday April 07, 2024 @06:36PM (#39964568)
Eric Strebel did something similar with this: https://www.youtube.com/watch?v=W_nY6VtMjRM I'ts not compressed into a form, but also tickles the inspiration.