Many imported 3D models have "flipped normals" or holes that prevent them from being "solid". Use the Repair Tool in Windows 3D Builder or automated repairs in Orca Slicer to automatically stitch surfaces together into a single block. 2. Convert Mesh to Solid
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* Brad DuBois. Admin. Yes. Your Normals are flipped in certain areas and they need to be corrected before you export from Blender. Facebook·Blender for Absolute Beginners (BfAB) Many imported 3D models have "flipped normals" or