The Crown Grip

Project Overview

Crown Grip is an ergonomic system designed for barbers and stylists to explore alternative hand positioning and grip orientation. Traditional shears often require high shoulder elevation and specific wrist angles that can become strenuous during extended professional use.

Instead of requiring stylists to invest in specialized equipment, I developed a modular aftermarket system. The goal was to preserve the tools stylists already value while transforming the mechanical interaction between the hand and the shears.

Design Focus

This project evolved into a three-part mechanical assembly focused on user comfort and tool control:

• 360° Rotation: Allowing the thumb-well to rotate freely enables a wider range of cutting angles. This reduces the mechanical need for high wrist flexion or shoulder abduction.

• Universal Interface: Designing a compliant geometry that fits various shear brands and hole diameters.

• Leverage Adjustment: Increasing the finger-hole spacing to alter the force distribution required to operate the shears.

The Assembly System

To achieve a balance of flexibility and control, I developed three specialized components:

• The Crown (TPU 95A): Features flexible "spikes" that compress into standard metal finger holes. This geometric compliance ensures a secure, high-friction fit across various brands.

• The Sceptre (TPU 95A): A customizable extension that balances soft-touch comfort with the structural integrity needed for precision tool control.

• The Throne (PETG): A rigid support component designed to limit the rotation range for users who apply higher force during operation.

Functional Breakthrough

The TPU Spike Interface was the turning point for this design. By using individual spikes rather than a solid mass, the material can conform to both oval and circular shear holes. This turned a complex sizing problem into a simple, flexible solution that maintains its grip even under professional use.

Reflection & Tools

• Key Lesson: Professional tools require granular tactile feedback. Moving from a single-material print to a multi-material assembly allowed me to control exactly where the device flexes and where it remains rigid.

• CAD: Plasticity | 3D Printing: Prusa CORE One | Slicing: PrusaSlicer

Disclaimer & Safety

Not a Medical Device: Crown Grip is an experimental ergonomic prototype. It has NOT been evaluated, approved, or endorsed by any medical or regulatory body (such as Health Canada or the FDA). It is not intended to treat, cure, or manage any medical condition.

Sharp Tool Hazard: This accessory is designed for use with sharp instruments. A failure of a 3D-printed part could result in a loss of control of the shears. Always inspect the assembly for wear or material fatigue before use.

User is the Manufacturer: By downloading these files, the user acknowledges they are the manufacturer of the physical object and assume 100% responsibility for material selection, print settings, and safety testing.

Evolution of the Design