Flexible prints can be both elastic and strong when rigidity and flexibility are separated by geometry. Use a stiff support structure with compliant contact zones instead of making the whole part soft.
Design approach
- Stiff load path.
- Compliant zones.
- Progressive thickness.
- Rounded transitions.
Material
TPU supports elastic contact; PETG, PA or rigid inserts carry load. Avoid thin unsupported walls.
Validate
- Static load.
- Cycles.
- Permanent set.
| Zone | Function | Check |
|---|---|---|
| Frame | Carry load | Deflection |
| Contact | Flex | Recovery |
| Transition | Stress | Cracks |
| Mount | Fix | Loosening |
Common engineering mistakes
- Only changing hardness.
- Making everything soft.
- Sharp transitions.
- Static test only.
- Ignoring mounting.
Buyer checklist
- Where is the load?
- How much deflection?
- Is a stiff frame needed?
- Are transitions smooth?
- Was cycling tested?
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