I found this water soluble polymer called PVOH and I think it would make a perfect support material. see the website [www.solutions4plastic.co.uk]

Did someone already the idea of using this material for support ?

I don't have a RepRap yet but I am starting to gather part to make one.

Yes it has been proposed before but I don't think anybody has tried it yet. It would need to be in rod form for the current extruder.

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[www.hydraraptor.blogspot.com]