Design so it actually prints.
3D modeling from the printer's point of view.
Thousands of tutorials teach you how to use Blender. 3DPrintLore teaches the part they skip: how to model so the result is printable — manifold meshes, sensible wall thicknesses, overhangs, tolerances and fit.
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Why a model prints at all: mesh, manifold/watertight, wall thickness and more.
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