Overhangs & Supports
Design parts that print cleanly without unnecessary supports.
Overhangs are one of the most important factors in 3D printing design. Because FDM printing builds parts layer by layer, each layer needs support from the one below.
When geometry extends too far outward, the printer cannot support the material — leading to sagging, poor surface finish, or failed prints.
Key Overhang Rules
When Are Supports Required?
Supports are typically required when overhang angles exceed 45°, or when features have no underlying structure to support them. Complex geometries and large flat overhangs are the most common cases.
How to Avoid Supports
• Use chamfers instead of sharp overhangs
• Split parts into multiple components
• Reorient parts before printing
• Design self-supporting angles
Why Minimising Supports Matters
Supports increase material usage, extend print time, and require post-processing. Reducing supports leads to faster, cheaper prints and better surface quality.
Key Takeaways
Keep overhangs below 45° where possible
Use orientation to eliminate problem areas
Supports increase cost and print time
Design for self-supporting geometry