Design Specification Template
Technical design document specifying how requirements will be implemented.
Design Document Information
- Project: _________________________
- Design Version: _________________________
- Date: _________________________
- Designed By: _________________________
- Reviewed By: _________________________
Design Overview
Problem Statement: (What are we solving?)
Solution Approach: (High-level how we’ll solve it)
Key Design Decisions:
Component Breakdown
Component 1: [Component Name]
Purpose:
Specifications:
- Dimensions: ________________________________________________________
- Material: __________________________________________________________
- Quantity: __________________________________________________________
Design Rationale: (Why this approach?)
Related Components:
- Connects to: _______________________________________________________
- Interfaces with: ____________________________________________________
Manufacturing Considerations:
- Support structures needed: ___________________________________________
- Orientation for print: _______________________________________________
- Estimated print time: _______________________________________________
Component 2: [Component Name]
(Repeat structure for each component)
Assembly Design
Overall Assembly Structure: (How components fit together)
Assembly Sequence:
Fastening Methods:
- Snap fits (location: ___________________________________)
- Threaded inserts (quantity: ______)
- Glue/adhesive (type: ________________)
- Other: _______________________________________________________
Assembly Challenges & Solutions:
- Challenge: _________________________________________________________ Solution: __________________________________________________________
Material Selection
Primary Material: ______________________________________________
Why this material?
| Property | Requirement | Selected Material | Alternative |
|---|---|---|---|
| Strength | |||
| Flexibility | |||
| Temperature | |||
| Cost | |||
| Availability |
Material Properties:
- Nozzle temperature: ______________________________________________
- Bed temperature: __________________________________________________
- Print speed: _______________________________________________________
- Support required: __________________________________________________
- Post-processing: __________________________________________________
Material Alternatives & Trade-offs:
- Option 1: _________________________________________________________
- Option 2: _________________________________________________________
- Selected option rationale: ___________________________________________
Design Features
Feature 1: [Feature Name]
Purpose:
Design Details:
- Dimensions: ________________________________________________________
- Placement: _________________________________________________________
- Tolerances: ________________________________________________________
Rationale: (Why designed this way?)
Related Requirement: (Which requirement does this fulfill?)
Feature 2: [Feature Name]
(Repeat for each significant feature)
Tolerance & Fit Analysis
Critical Dimensions:
| Dimension | Tolerance | Rationale | Risk |
|---|---|---|---|
| +/-_mm | |||
| +/-_mm |
Fit Relationships:
- Part A to Part B: _____________________________________________________
- Part B to Part C: _____________________________________________________
Validation Plan:
- Print test version before production
- Measure critical dimensions
- Test assembly fit
- Perform functional test
Manufacturing Planning
Print Parameters
Slicer Settings:
- Layer height: ______________________________________________________
- Infill: ____________________________________________________________
- Support material: __________________________________________________
- Raft/brim: _________________________________________________________
Print Time & Material:
- Estimated time: ____________________________________________________
- Material weight: ___________________________________________________
- Cost estimate: _____________________________________________________
Orientation Strategy: (How will this be oriented during printing?)
- Rationale: _________________________________________________________
- Risks: _____________________________________________________________
- Mitigation: ________________________________________________________
Post-Processing
Cleanup:
- Remove supports (method: ______________________________________)
- Remove raft/brim (method: _____________________________________)
- Sand edges (grit: _____________)
- Smooth surfaces (method: _______________________________________)
Finishing:
- Paint/coat (type: ____________________________________________)
- Treat for durability: __________________________________________
- Inspect quality: ________________________________________________
Assembly Work:
- Insert threaded nuts/inserts
- Assemble components
- Test functionality
Estimated Total Time: ____________ hours
Testing Plan
Functionality Tests:
| Test | Method | Pass Criteria | Status |
|---|---|---|---|
Durability Tests:
- Stress test: _______________________________________________________
- Environmental exposure: ____________________________________________
- Lifecycle test: _____________________________________________________
Tolerance Verification:
- Measure key dimensions
- Compare to specification
- Document variance
Design Risks & Mitigation
Risk 1:
- Description: _______________________________________________________
- Probability: [ ] High [ ] Medium [ ] Low
- Impact: [ ] Critical [ ] Major [ ] Minor
- Mitigation: ________________________________________________________
- Contingency: _______________________________________________________
Risk 2: (Continue for identified risks)
Design Alternatives Considered
Alternative 1:
- Approach: _________________________________________________________
- Pros: ______________________________________________________________
- Cons: ______________________________________________________________
- Why not selected: __________________________________________________
Alternative 2: (Continue for each alternative considered)
Technical Specifications
Dimensional Drawing Reference
(Attach or describe detailed drawings/models)
- CAD file: __________________________________________________________
- Drawing revision: __________________________________________________
Performance Specifications
- Load capacity: _____________________________________________________
- Temperature range: _________________________________________________
- Lifespan: __________________________________________________________
- Accuracy/precision: ________________________________________________
Bill of Materials (BOM)
| Item | Part # | Quantity | Unit Cost | Notes |
|---|---|---|---|---|
| 3D Printed Main Body | - | 1 | $0.XX | PLA |
Total Material Cost: $__________
Design Verification Checklist
Before manufacturing:
- All components specified
- Material selected and justified
- Assembly method documented
- Tolerances verified
- Manufacturing plan complete
- Testing approach defined
- Risks documented
- Cost estimates calculated
- Timeline realistic
- Design approved by stakeholders
Design Change Log
| Change # | Date | Description | Reason | Impact |
|---|---|---|---|---|
Sign-Off
Design Approval:
| Role | Name | Signature | Date |
|---|---|---|---|
| Designer | |||
| Reviewer | |||
| Stakeholder |
Status:
- Approved - Ready for manufacturing
- Approved with conditions: ________________________________
- Not approved - Revisions needed: ____________________________
Appendices
- Appendix A: Detailed CAD Models
- Appendix B: Assembly Instructions
- Appendix C: Material Data Sheets
- Appendix D: Test Reports