When a mesh 3D model flickers during extrusion, it’s usually due to non-manifold geometry (e.g., overlapping faces/edges) or incorrect face normals causing rendering conflicts.
Non-manifold parts—like two faces sharing an edge but facing opposite directions—confuse the software about which side to render, leading to flickering as it switches interpretations. This often happens from duplicated faces, poor vertex merging, or messy Boolean tool use.
Flipped normals (inward instead of outward) also trigger conflicts; the software can’t decide the “front” face, so it flickers between displays.
To fix it: - Use your software’s non-manifold edge selection tool to clean up overlapping parts. - Recalculate normals to face outward consistently.
These quick steps resolve most flickering issues.