# Designing Functional Parts 3D printing isn't just for toys. You can make real, useful parts. ## Key Considerations ### Orientation Print orientation affects strength. Layers are the weak point. ### Wall Thickness More walls = more strength. Infill matters less. ### Material Choice - **PLA**: Brittle, low heat resistance. - **PETG**: Flexible, tough. - **ASA/ABS**: UV resistant, strong.  Start designing today!