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3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
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You think about it the wrong way. Do it progressively : 3d print the thin plastic form 10cm high, then pour the concrete, let it dry, print 10 more cm, pour again ... That way you need very few plastic.
That would take a very long time.