To extrude a 3D model in hard surface work, select a face, edge, or vertex in software like Blender or Maya, use the extrude tool, and adjust distance/direction to add volume while keeping sharp, geometric edges—key to hard surface’s precise aesthetic.
Use axis locking (e.g., X/Y/Z keys in Blender) to ensure extrusions stay straight; this avoids accidental rounding and preserves clean angles.
Add edge loops before extruding complex areas—they reinforce structure and prevent soft corners, essential for mechanical parts (gears, panels) or architectural details (facades, windows).
For beginners, start simple: Use Blender’s E key to extrude a cube along one axis first, mastering sharpness before trying multi-directional extrusions.