More Details
Background & Customer Needs
This project was developed for a consumer product brand preparing a new handheld brush for market validation.
Before investing in injection molding, the customer needed real, functional prototypes to verify:
- Bristle strength and retention
- Handle grip and balance
- Overall product appearance
- Logo position and marking quality
The prototype had to be durable enough for real-use testing, not just visual evaluation.
Key Challenges
Brush-type products are difficult to prototype because:
- Bristles may loosen or fall out if fixation is weak
- Handle geometry must feel correct in hand
- Surface markings must be clear and consistent
The customer needed a rapid prototyping solution that could combine:
- Mechanical accuracy
- Assembly-level processing
- Production-like performance
Rapid Prototyping Solution
- CNC Machined ABS Handle
The brush handle was produced from ABS engineering plastic using CNC machining.
Why CNC machining for this prototype?
- Accurate geometry for ergonomic testing
- Smooth surface for appearance evaluation
- Easy design changes for fast iteration
After machining, laser engraving was applied to add the logo and product information with sharp edges and high contrast.
Nylon Bristle Head: Bristle Tufting & Heat Pressing
For the brush head:
- Nylon bristles were mechanically tufted into a rigid plastic base
- Heat pressing was applied to securely lock the bristles in place
This ensured:
- Strong bristle retention during repeated use
- A structure close to final mass production
- Reliable performance in functional testing
The result was a true functional prototype, not a fragile display sample.
Key Features & Advantages
1️⃣Production-Like Structure
The combination of CNC machining and heat pressing creates a prototype that behaves similarly to a mass-produced product.
2️⃣Strong Bristle Retention
Bristles remain stable during repeated testing, avoiding common prototype failures.
3️⃣Fast Design Iteration
CNC-machined ABS handles allow quick geometry changes without tooling costs.
4️⃣Clear Branding Validation
Laser engraving helps confirm logo size, placement, and visual quality before mass production.
Technical Specifications
| Parameter | Value |
|---|---|
| Handle Material | ABS engineering plastic |
| Handle Process | CNC machining |
| Surface Marking | Laser engraving |
| Bristle Material | Nylon |
| Bristle Fixation | Mechanical tufting + heat pressing |
| Prototype Type | Functional prototype |
| Assembly | Manual prototype assembly |
Application Scenarios
▶️Household cleaning brushes
▶️Personal care tools
▶️Consumer product design validation
▶️Pre-tooling functional testing
This type of rapid prototyping is ideal for consumer goods development.
Why This Case Matters
This case demonstrates that rapid prototyping is not limited to metal parts.
With the right combination of processes, plastic consumer products can achieve: Real functional testing | Reliable user feedback | Reduced development risk
This step can save significant time and cost before tooling investment.
Production Process & Quality Assurance
- DFM Review: Design and bristle layout are reviewed before machining to reduce manufacturing risks.
- Rapid Prototyping: Physical samples are delivered within days for real-use testing.
- Assembly Verification: Bristle strength and handle assembly are manually tested.
- Quality Commitment: If the prototype fails due to processing issues, rework support is provided.
