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Yes, remember that the fibres have to be beaten for 8 hours, until you see a paste. To beat them, the blender is not good, because the slicing action is something to avoid. The only way to do it without machine is to use a stick and beat the cotton, and of course never change the water. good links to watchhttps://www.youtube.com/watch?v=JPqjLzAnSIMhttps://www.youtube.com/watch?v=TOoP4VStx88
To avoid failure you should simply use cotton balls. Then, to press, you can use a bottle as a roller, and finally add the diluted pva glue (rather than adding glue to the vat).