Product Design, Feasibility, & Manufacturing Outline for Kitchen Sponge Sterilization Appliance

1. ©
Tara
Finance & MS&E
taralv@stanford.edu
Ben
Mechanical Engineering
bdgarcia@stanford.edu
Marcus
Product Design
mbusby@stanford.edu
Chinmay
Materials Science
chinmayn@stanford.edu
Who We Are What We Do
For everyone who
unavoidably uses dirty
sponges to wash dishes, the
MainSqueeze is a kitchen
appliance that sterilizes
kitchen sponges in-between
uses.

2. ©
Heated aluminum ribs accelerate drying
UV light sanitizes the sponge
How It Works

3. ©
How We’re Building It
Spec Controlled Parts
Processes
Bridge/Rapid Process
• Selective Laser Sintering using ABS
plastic for both the top and bottom
plastic pieces
• Ultrasonic Welding to join the two
parts
Dimensions
• Top Plate: 7.0” x 5.0” x 0.5”
• Bottom Plate: 8.0” x 6.0” x 3.0”
Tolerance
• 0.05”
Focus on Plastic Enclosure

4. ©
Picking Our Partners
TargetVendors
High impact ABS-like material via SLA:
• Qty 25 each (50 parts) = $7,050
• Qty 50 each (100 parts) = $12,800
• Qty 150 each (300 parts) = $28,200
Our Decision:
- Cost
- Professionalism/Reliability
- Customization

5. ©
Putting the Pieces Together
Process Maps
Bottom Case Subassembly
- Stack the PCB assembly into the bottom shell
and use 4 screws to fasten
-Take the power cord, insert into bottom shell
and connect it to PCB connector on the PCB
- Fix and test rubber gasket seal between
power cord and bottom shell for
waterproofing
Top Case Subassembly
-Take the individual aluminum ribs (2 x6) and
insert them into the slots on theTop Cover
- Ensure contact with heating element on PCB
PlaceTop Case Assembly on the Bottom Case
Assembly and ultrasonically weld the two
together. Conduct final FuntionalTest rework
if needed.

6. ©
Making Sure It Works
Quality Control
FMEA CTQ Points for the MainSqueeze:
From the FMEA, we found that the two most
pertinent features were waterproofing heating/
lighting issues (both consumer safety product
quality).We dug deeper to isolate the more
specific CTQ points below.
• Ultrasonic welding of top and bottom case
enclosure pieces (product performance)
• Top case subassembly - fixing the aluminum ribs
into the plastic enclosure (product safety)
• Top case subassembly - ensuring contact with
UV light heat source on PCB (product
performance)
• Waterproofing - rubber gasket seal between
power cord and bottom enclosure (product
safety)
• Final product test

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How We’re Testing
Final FT LeakTest
1. If needed, add distilled
water the test fixture so
that the water level is at
the fill line.
2. Place the fully assembled
MainSqueeze on the lid’s platform.
3. Place the lid and
MainSqueeze into the
test fixture, and lock it
in place by tightening
the highlighted nuts.
4.Turn on the
vacuum until the
pressure has risen
to 1.5 atm.
5. Lower the shelf, so
the MainSqueeze is fully
submerged in the
water.Wait 2 minutes.
6. Slowly release the
pressure by lowering
the lever on the side
of the test fixture.
This should take no
less than 10 seconds.
7.While you are releasing the pressure,
observe. If any bubbles emerge from the
MainSqueeze, the assembly has failed
the test. If no bubbles are emerge, the
assembly has passed.
8. Close the valve on
the side of the device
by raising the lever.
9. Unlock the lid of
the test fixture by
unscrewing the
highlighted nuts,
and retrieve the
MainSqueeze from
the fixture.

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How We’re Pricing
Unit Cost
Budget
MSRP $30
Sell to distributors for
$22.85
Targeting COGS of
$14.28
Prototype Cost $608.68/ea
25 units
PCB $150
Heating Elements $150
Plug $50
Plastic Enclosure
$258.68

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Wrapping It Up
Packaging
Distribution
Online
$22.85
60% margin
$1.14
5% margin
$6.00
25% margin
$30.00
Selling Price
$26.09
83% margin
$30.00
Selling Price
$4.91
15% margin (plus
subscription fees not
factored)
$30.00
110% margin
$30.00
Selling Price
COGS = $14.28

10. ©
What’s Left
Next Steps
Learning
• Will it work? – Lab testing
• Finding the right vendor – sending
more RFQs
• Design of electronics – Finding and
driving the correct light heat sources
• UL certifications (wet environment +
electronic device)
• Funding:
• Kickstarter
• Generous Relative
• Patents/intellectual Property
• Working with Contractors – moving
past the start-up phase
• Timing Having a Plan
• Product Start Ups
• Otherwise:
• Take what we learned into
future projects