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FluidNC

  • Software
  • Robot arms and industry
  • Firmware

FluidNC is CNC machine firmware for the ESP32 controller, the next generation from the creators of Grbl_ESP32, with a built-in web UI for controlling machines.

Source on GitHub: github.com/bdring/FluidNC (opens in a new tab). Facts read at commit 91958cc (opens in a new tab).

Licenses

Code
GPL-3.0-only (opens in a new tab)

Read by Robotheca from LICENSE (opens in a new tab) (GPL-3.0-only) at commit 91958cc (opens in a new tab), on 16 Oct 2026.

Commercial use
Yes

Copyleft: Modified source must be published.

What it does

  • Runs on ESP32 and needs no compilation; an install script uploads the firmware and machine behavior is set by a text config file.
  • Config files are uploaded over USB/serial or WiFi, and several can be stored on the ESP32, selected with a $Config/Filename command.
  • Supports machines with multiple tool types, such as laser plus spindle or a tool changer.
  • Keeps Grbl compatibility: the G-code send/response protocol is unchanged and all Grbl G-code is supported.
  • Includes a browser-based Web UI reachable from a PC, phone, or tablet on the same WiFi network.
  • Provides a tools directory with a config spec, JSON Schema, validator, and an MCP server to help AI assistants write configs.

Written by Robotheca from the project's README (opens in a new tab) at commit 91958cc.

Getting started

Difficulty
Intermediate
Hardware it needs, as the project states it
ESP32 controller

Maintenance

Status
Active: a commit in the last 90 days
Newest commit
16 Oct 2026 on main
Latest release
v4.1.1 (26 Sept 2026)

Checked on GitHub on 16 Oct 2026.

Links

Robots on Robotheca that use it

No robot on Robotheca is linked to it yet. Links come from a robot's robot.yaml, from its dependency files read as text, or from Robotheca's editors.

Robotheca lists software as a reference: nothing is hosted or run here, and every fact links to where it was read.