1. P10551 - Nano-ink Deposition System Detail Design Review
FAB AMERICA
Eric Hettler - ME
William Gallagher - ISE
Christopher Mieney - ME
Gregory Ryan - ME
Joseph Cole - EE

2. Project Overview Fab@Home open-source architecture
Print photo-curable resin
Color printing used as a vehicle to demonstrate multi-material print capability

3. Systems Overview

4. Material Delivery
Proposed Design: Micro Valves
Proposed Design: material delivery nozzles Tube ID: .033”-.002”
Photos From The Lee Company

5. Pre-Colored Epoxy Reservoirs
Color Delivery Concept
Proposed Design: Pre-Colored Resin
Manifold
Pre-Colored Epoxy Reservoirs
Deposition
Mixing Process
Magical Mixing Process
Output

6. Resins Tested resin being dispensed through syringe
Dyed the resin with an alcohol ink to test compatibility
The ink contained suspended copper particles

7. Curing – Mini Halogen Design Alternative – UV Fluorescents
355nm = 3.05E-3 (W/cm^2)
Cure Time Estimate
Design Alternative – UV Fluorescents
Inexpensive, ~ $30
Ease of implementation

8. Valve Controls Constant 24 volts for the spike
Constant 3.5 volts for the hold
5 volt is pulsed
The rising edge initiates the spike and hold

9. Rubric Progress Deliverable (weight) Score in Week (#) Max. Score
Excellent/Very Good
Good/Acceptable
Barely acceptable
Unacceptable
Bill of Materials
(9) 3
BOM is complete, and long lead time items and vendors have been identified. (3 points)
BOM is partly complete - some specifics still remain to be defined. (1-2 points)
BOM is imcomplete, most items not specified. (0 points)
Drawings/Schematics 5
All drawings for parts to be manufactured are complete, assembly drawings demonstrate that system assembly is feasible. (5 points)
Most drawings or schematics are complete, assembly drawings are nearly done. (3-4 points)
Some drawings are complete, others are not done or require modification. (1-2 points)
Few, if any, drawings or schematics exist beyond hand sketches or concept drawings. (0 points)
Feasibility Analysis 7
Significant analysis has been done to demonstrate feasibility of all systems/components. Appropriate links to the risk assessment activity are complete. (6-7 points)
Most design features have convincing support, some require further work. Link to risk assessment partly complete. (4-5 points)
Many design features require further analysis to demonstrate feasibility. (2-3 points)
Little analysis has been done to demonstrate feasibility. (0 points)
Risk Assessment and actions to minimize risks - Detailed Design phase
As detailed design phase has progressed, the initial list of risks has been reviewed and updated. Actions that could be taken to minimize risks have been taken and documented. (3 points)
Plans are in-place for to monitor and take action on most of the key risks the plans and analyses are missing some key elements. (1-2 points)
Plans are not in place to reassess and minimize the impacts of risk. (0 points)
Knowledge & understanding of design
Thorough and in-depth understanding is evident of the design (system & relevant subsystems) and rationale for design decisions and tradeoffs. (6-7 points)
Good understanding is evident of the design and rationale for most design decisions and tradeoffs. (4-5 points)
General comprehension of the design is evident but rationale for decisions is not solid and tradeoffs are not well understood. (2-3 points)
Superficial understanding of the design is evident at either the system or subsystem level. Rationale for specific design decisions and tradeoffs is poorly understood, if at all. (0 points)
Plan to meet Customer Needs/Engineering Specifications including a Preliminary Test Plan
Sufficient evidence is presented to demonstrate that customer needs and design specs will be met. This includes development and documentation of a preliminary test plan using the suggested format (6-7 points)
Team demonstrated that most customer needs and design specs will be met. Test plan has been developed but could be more specific (4-5 points)
Team demonstrated that some needs and specs will be met, but others require significant further analysis. (2-3 points)
Many questions remain as to whether needs and specs will be met. There is no test plan (0 points)