Drill Bit Sharpener for Bench Grinder – 3D Printed

The jig holds the drill bit at a fixed angle relative to the grinding wheel, making it easier to achieve symmetrical cutting edges and a proper point angle, even for beginners.

Included Attachments

This design includes three separate angle attachments to cover the most common drill point geometries:

• 90° – for soft materials and plastics
• 120° – standard general-purpose drill bits
• 135° – ideal for harder materials and reduced walking

Simply swap the attachment to match the desired drill bit angle.

Features

• Designed to mount securely on a standard bench grinder
• Fixed-angle guides for accurate and repeatable sharpening
• Simple, robust design optimized for 3D printing
• Improves repeatability and extends drill bit life
• Ideal for workshops, garages, and maker spaces

Printing Notes

• Print in PETG or ABS for better heat resistance (PLA may soften near the grinder)
• No supports required (adjust if needed)
• Recommended infill: 30–50% for strength and durability

Usage

1. Select the desired angle attachment (90°, 120°, or 135°)
2. Insert the drill bit into the holder
3. Lightly grind each cutting edge evenly
4. Rotate and repeat until sharp