Functional Foaming Shower Head redesign and testing
Budget: $50 – $0 USD
Project Request: Custom Foaming Shower Head (Functional Prototype & 3D Model)
Hello,
I’m looking to hire an experienced product designer / mechanical engineer with 3D printing experience to help us develop a fully functional foaming shower head by modifying an existing foaming car wash sprayer design.
This is not a cosmetic or conceptual project — the end goal is a working, printable, testable part that produces thick, luxurious foam when installed inline with a standard household shower.
Please refer to my notes in this image: https://www.dropbox.com/scl/fi/cptt88p4b9lxfid0mwfdn/Drawing.jpg?rlkey=mll2kke8bt8uhz3bh5flfl14i&dl=0
1. Reference Product (Base Design)
We want you to replicate the internal functional design of the following product:
Reference Product (Foaming Car Wash Sprayer):
https://www.amazon.com/dp/B0C2YV17J6
This product appears to use a venturi effect to pull liquid concentrate from the bottle, mix it with water, and expel thick foam. That internal geometry and flow path are critical and must be preserved functionally.
We will send you:
Two physical units
One to keep intact
One you can cut in half and disassemble for internal measurements
Additional plumbing components for shower installation and testing
Important: A previous designer produced a beautiful model that did not function. Precision here matters. My husband is a machinist and will be reviewing tolerances and functionality closely.
2. Scope of Work (What We Need Modeled)
You will create an EXACT, dimensionally accurate 3D model replica of the functional components we are using, with required modifications listed below.
Parts to Model
Lid / cap assembly
Internal venturi / siphon components
Nozzle (with internal screen preserved)
Threaded collar / neck
Do NOT model:
Trigger handle
Hose sprayer handle
Jar
Dial / adjustment knob
3. Required Modifications
A. Shower Compatibility
Inside thread of collar must be ½-inch female NPT
Must screw directly onto a standard shower arm
Outside geometry should match inside alignment exactly
B. Bottle / Jar Compatibility
We will be using this jar (wider mouth, different threads):
https://www.berlinpackaging.com/34332-b-32-oz-clear-pet-plastic-general-purpose-jars-caps-not-included/
Lid threads must be modified to fit this jar
We will send you a physical jar for reference
Jar interface must seal properly under water pressure
C. Foam Ratio Control
We do not want a dial
The internal siphon hole should be sized to match the equivalent of “Setting 2” on the original product
Goal: thick, spa-like foam, not watery spray
D. Nozzle Aesthetics
Original nozzle internals remain unchanged
Add a decorative outer sleeve over the nozzle
“Gun silencer” aesthetic (purely cosmetic)
Tip must remain exposed so the spray fans properly
E. Simplification
Remove ridges and unnecessary decorative elements
Clean, modern, minimal design
We may request our logo inverted into the neck area
4. Printing & Testing Requirements
This is critical:
You must print prototypes yourself
Material: TPU or PETG, other recommendations acceptable
My 3D Printer: Bambu Labs H2D (AMS-compatible)
You must install and test it in your own shower
Validate:
Foam density
Proper siphoning
No leaks
Secure mounting
Consistent spray pattern
This is a functional consumer product, not a bench-only test.
5. Deliverables
Final print-ready 3D files (STL + native CAD)
Documentation on:
Internal flow path
Any recommended tolerance adjustments
Known limitations or suggested improvements
Iteration support if small changes are needed to ensure performance
6. Engineering Flexibility
If, during development, you believe:
A geometry change is required for better venturi performance
A tolerance adjustment is needed for TPU
A small design compromise will improve real-world function
Please propose it. Function comes first.
7. Quoting & Timeline
Please provide:
Estimated cost
Estimated timeline
Number of prototype iterations included
Any assumptions or constraints you see up front
Thank you,
Teresa Holm
Hello,
I’m looking to hire an experienced product designer / mechanical engineer with 3D printing experience to help us develop a fully functional foaming shower head by modifying an existing foaming car wash sprayer design.
This is not a cosmetic or conceptual project — the end goal is a working, printable, testable part that produces thick, luxurious foam when installed inline with a standard household shower.
Please refer to my notes in this image: https://www.dropbox.com/scl/fi/cptt88p4b9lxfid0mwfdn/Drawing.jpg?rlkey=mll2kke8bt8uhz3bh5flfl14i&dl=0
1. Reference Product (Base Design)
We want you to replicate the internal functional design of the following product:
Reference Product (Foaming Car Wash Sprayer):
https://www.amazon.com/dp/B0C2YV17J6
This product appears to use a venturi effect to pull liquid concentrate from the bottle, mix it with water, and expel thick foam. That internal geometry and flow path are critical and must be preserved functionally.
We will send you:
Two physical units
One to keep intact
One you can cut in half and disassemble for internal measurements
Additional plumbing components for shower installation and testing
Important: A previous designer produced a beautiful model that did not function. Precision here matters. My husband is a machinist and will be reviewing tolerances and functionality closely.
2. Scope of Work (What We Need Modeled)
You will create an EXACT, dimensionally accurate 3D model replica of the functional components we are using, with required modifications listed below.
Parts to Model
Lid / cap assembly
Internal venturi / siphon components
Nozzle (with internal screen preserved)
Threaded collar / neck
Do NOT model:
Trigger handle
Hose sprayer handle
Jar
Dial / adjustment knob
3. Required Modifications
A. Shower Compatibility
Inside thread of collar must be ½-inch female NPT
Must screw directly onto a standard shower arm
Outside geometry should match inside alignment exactly
B. Bottle / Jar Compatibility
We will be using this jar (wider mouth, different threads):
https://www.berlinpackaging.com/34332-b-32-oz-clear-pet-plastic-general-purpose-jars-caps-not-included/
Lid threads must be modified to fit this jar
We will send you a physical jar for reference
Jar interface must seal properly under water pressure
C. Foam Ratio Control
We do not want a dial
The internal siphon hole should be sized to match the equivalent of “Setting 2” on the original product
Goal: thick, spa-like foam, not watery spray
D. Nozzle Aesthetics
Original nozzle internals remain unchanged
Add a decorative outer sleeve over the nozzle
“Gun silencer” aesthetic (purely cosmetic)
Tip must remain exposed so the spray fans properly
E. Simplification
Remove ridges and unnecessary decorative elements
Clean, modern, minimal design
We may request our logo inverted into the neck area
4. Printing & Testing Requirements
This is critical:
You must print prototypes yourself
Material: TPU or PETG, other recommendations acceptable
My 3D Printer: Bambu Labs H2D (AMS-compatible)
You must install and test it in your own shower
Validate:
Foam density
Proper siphoning
No leaks
Secure mounting
Consistent spray pattern
This is a functional consumer product, not a bench-only test.
5. Deliverables
Final print-ready 3D files (STL + native CAD)
Documentation on:
Internal flow path
Any recommended tolerance adjustments
Known limitations or suggested improvements
Iteration support if small changes are needed to ensure performance
6. Engineering Flexibility
If, during development, you believe:
A geometry change is required for better venturi performance
A tolerance adjustment is needed for TPU
A small design compromise will improve real-world function
Please propose it. Function comes first.
7. Quoting & Timeline
Please provide:
Estimated cost
Estimated timeline
Number of prototype iterations included
Any assumptions or constraints you see up front
Thank you,
Teresa Holm