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You should not do this. Foam insulation (EPS, XPS, etc.) needs to be covered with drywall in order to protect it (extend the amount of time before it melts) from fire. Otherwise you are risk of being exposed to toxic fumes and melting foam should you ever have a fire. Imagine molten foam dripping from your ceiling onto you - not a situation you want to find ...


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Beware that if in a use that is subject to plumbing code, your 3D printed item almost certainly will be a code violation. The probable best bet (and I'm not guaranteeing success) would be a "Multipurpose plastic pipe glue" - go to the plumbing section, find the PVC pipe cement, don't buy that - look for the somewhat smaller stock of pipe cement that claims ...


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Yes you can. I have my guys use Liquid Nails for ceilings. We still add screws but not really sure you HAVE TO. Definitely nothing wrong with using the correct adhesive for a few studs on a piece of drywall.



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