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

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