Part Orientation and Support Generation

Part orientation

Orientation is how the part is placed on the build platform. It affects:

Factor	Effect
Surface finish	Staircase effect is worst on inclined and curved surfaces
Strength	Parts are weakest between layers (Z direction)
Build time	Taller orientation means more layers and more time
Support volume	Overhangs need supports
Accuracy	Critical features should face the plane with best resolution
Material use and cost	More supports waste material

Good practice: place the largest flat face on the bed, keep critical surfaces away from supports and align load direction with the layers.

Support generation

Supports are temporary structures that hold overhangs and islands, anchor the part and carry heat away. They are needed for overhang angles above about 45 degrees.

Types of supports

• Linear / tree / lattice (FDM), solid or perforated blocks (SLA), no supports needed in powder-bed processes (powder supports the part).
• Support settings: density, overhang angle, contact gap, interface layers.
• Drawbacks: extra material and time, surface marks and removal effort.

Exam tip

Draw the overhang with supports and explain how orientation reduces support use.