Open hardware · CoreXY · ESP32

AutoSharpener Razor-sharp.
Every time.

A desktop machine that delivers sharp, polished cutting-tool edges. Each tool is locked at a fixed angle and worked tirelessly across a water stone, for precise, repeatable results.

Everything you need to build your own (instructions, files and software) is free to download. Make it yours.

Build your own Explore in 3D
AutoSharpener: red 3D-printed CoreXY frame with tool carriage, stone holder, peristaltic pump and control box
8+patterns
to sharpen tools
1knob
controls everything
146×58mm
carriage travel
2–300mm/s
live feed rate
0end-stops
sensorless homing
The machine

Main features

A CoreXY gantry sweeps each tool across a stationary water stone. Every pass follows a programmed path at the same angle and pressure, for precise, repeatable sharpening.

CoreXY motion

Two NEMA 17 steppers drive a single belt loop on 8 mm guide rods, giving fast, rigid and accurate motion.

Fixed-angle clamp

Spring-loaded pressure screws hold the bevel flat against the stone. The angle never drifts, so the edge comes out even.

Drip pump

A third stepper drives an adjustable peristaltic pump that keeps the stone wet, so there’s no stopping to add water.

One-knob control

A clean, intuitive interface on a 1.9-inch color screen, driven entirely by a single knob. Powered by an ESP32.

iPhone app

Scan the QR code to link your iPhone, then control the AutoSharpener from it. Free on the App Store.

Download on the App Store

Self-test and homing

No end-stops needed. At startup, the machine checks its drivers, power supply and encoder, then homes against the frame.

Build your own

Everything you need

Print files, parts list, board files and source code — all here, all downloadable. Build Your Own →

Step 1

Parts list

Mechanical, electronics and tools — with where to buy.

Open → Step 2

3D prints

31 parts with 3D previews. 3MF and STL downloads.

Open → Step 3

Electronics

The controller PCB: Gerbers, KiCad project, checks before fitting.

Open → Step 4

Assembly

Frame, axes, belts, pump, electronics and cabling, step by step.

Open → Step 5

Firmware

Source code download and how to flash it.

Open → More

Background

The open-source projects and tools it is built on.

Open →