MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
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Helpful hint 2: We can all agree that you don't want supports inside your duct. It will be useless. But the duct should be printed in an orientation where some very steep overhangs will be unsupported by "touching buildplate" supports, so here's the saviour if you're gonna print in PETG: Tree supports. They support everything externally and don't generate inside. You're welcome.