Bearing Spin Cap for Precision Screwdrivers

I designed this bearing-based spin cap specifically for the metal precision screwdrivers shown in the photo.

This mod completely upgrades the user experience: it turns a basic screwdriver into a professional-style spinner, with smooth, controlled rotation and improved handling.

The system uses a 608zz bearing and dual O-Rings to achieve a firm, removable fit with zero wobble.

💡 This design includes two cap versions:

• 🔵 High Profile → more comfortable for palm support, ideal for longer sessions
• ⚫ Low Profile → more compact, perfect for portability or minimal setups

⚙ Features

• 🌀 Smooth and free rotation (real bearing, not plastic)
• 🎯 Specifically designed for this screwdriver model
• 🖐 Improved ergonomics and control
• 🔒 Secure fit with O-Rings (no glue required)
• 🧩 Simple and fast assembly
• 🔄 Two versions: high and low profile
• 🛠 Ideal for electronics, consoles, phones, and precision work

📦 Required components

• 1x 608zz bearing (8x22x7 mm)
• 2x O-rings (OD 8 mm / ID 5 mm / CS 1.5 mm)
• 2 printed parts:
  • Cap
  • Shaft

🖨 Print settings

• Material: PLA (works) / PETG (recommended)
• Layer height: 0.2 mm
• Infill: 30–50%
• Walls: 3+
• Supports: ❌ Not required
• Orientation:
  • Cap: base down
  • Shaft: vertical

🔧 Link to products used

• O-Ring OD8 ID5 X CS1.5 mm https://s.click.aliexpress.com/e/_c3TMd0xx
• Bearing 608zz (8x22x7mm) https://s.click.aliexpress.com/e/_c4pATZEd
• Screwdriver https://s.click.aliexpress.com/e/_c4Lwc8op

💡 Design notes

• Knurled exterior for better grip
• Dual O-ring system eliminates axial play
• Fully removable (no tools required)
• Available in both compact and ergonomic versions

🧪 How it works

The shaft is inserted into the bearing and held in place using the O-Rings.
The cap houses the bearing, allowing it to spin freely while you apply pressure from your palm.

Result: you can rotate the screwdriver with your fingers while maintaining constant downward pressure.

Low profile Picture

❤ Support

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