FW for ESP8266/ESP8285/ESP32 used with 3D printer
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Firmware for ESP8266/ESP8285 and ESP32 used with 3D printer

All Contributors

Latest stable release Release Version Release Date github-ci Release Version
please use Arduino ide 1.8.9+ with Release Version or Release Version

Latest development version Development Version GitHub last commit (branch) github-ci Development  Version
please use Arduino ide 1.8.9+ with Release Version or Release Version Project Page ESP3D 3.0

All releases

This firmware allows not only to have a cheap bridge between Wifi and serial, but also to have a web UI to configure wifi, to monitor 3D printer and even control it, and to make things easy, UI is fully customizable without reflashing FW.

Firmware should work with any 3D printer firmware (repetier/marlin/smoothieware using GCODE) if serial connection has a correct setup. I currently use it with my personnal flavor of repetier for Due based boards.

The web interface files are present in data directory but UI has it's own repository ESP3D-WEBUI.

  • Be aware ESP3D-WEBUI is for firmware 0.9.99 minimum - previous released version use tpl files which are no more used.
  • Note for ESP8266 1MB flash : FW is now too big will all features you need to chose strip the FW and select only some features, also WebUI is now also too big for full multilanguage support to fit the 128K SPIFFS so please use pack with limited language (en +another)

This branch does not take any new features, only bug fix, for new feature please use, thank you.




Become a sponsor or a supporter

  • A sponsor is a recurent donator
    If your tier is 10 US$/month or more, to thank you for your support, your logo / avatar will be added to the readme page with eventually with a link to your site.
  • A supporter is per time donator If your donation is over 120 US$ per year, to thank you for your support, your logo / avatar will be added to the readme page with eventually with a link to your site.

Every support is welcome, indeed helping users / developing new features need time and devices, donations contribute a lot to make things happen, thank you.

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  • Serial/Wifi bridge using configurable port 8888
  • Use GPIO2 to ground to reset all settings in hard way - 2-6 sec after boot / not before!! Set GPIO2 to ground before boot change boot mode and go to special boot that do not reach FW. Currently boot take 10 sec - giving 8 seconds to connect GPIO2 to GND and do a hard recovery for settings
  • Complete configuration by web browser (Station or Access point) or by Serial/telnet commands
  • Authentication (optional) for better security
  • Update firmware by web browser
  • Captive portal in Access point mode which redirect all unknow call to main page
  • mDNS which allows to key the name defined in web browser and connect only with bonjour installed on computer
  • SSDP, this feature is a discovery protocol, supported on Windows out of the box
  • Fail safe mode (Access point)is enabled if cannot connect to defined station at boot.
  • Embedded FS uploader and updater.
  • OLED screen support
  • Notifications using Line / Pushover / email
  • The web ui add even more feature :

Default Configuration

Default Settings:

  • Access Point: ESP3D
  • PW:12345678
  • Authentification: WPA
  • IP:
  • Baud rate: 115200
  • Web port:80
  • Data port: 8888
    if Authentication is enabled :
  • User: admin
  • Password: admin
  • User:user
  • Password: user

Direct commands:

Check wiki :

Installation instructions

See Wiki


Feedback on 2.0 was : ESP3D being a library is not really useful and make setup more complex, so now we are back to simple application.

  1. If you haven't already set up Arduino IDE for ESPs then do so for ESP8266 or ESP32 core version.
  2. Download the latest release and manually copy the libraries present in the ESP3D-x.y.z/libraries directory into your Arduino/libraries directory. (no need if using platformIO). These versions are verified to work with ESP3D, any others (newer version) may cause untested behavior.
  • Use webserver support (recommended as stable), asyncwebserver support is no longer stable on ESP3D
    • arduinoWebSockets from @Links2004

Generic ones:
Specific for ESP32

  • ESP32SSDP If you want OLED support:
  • oled-ssd1306 from @squix78

If you want DHT11/22 support:

  • DHT_sensor_library_for_ESPx from @beegee-tokyo
  1. Compile project esp3d.ino according target: ESP8266 board or ESP32 board, please review config.h to enable disable a feature, by default athentication is disabled and most others are enabled.
  1. Upload the data content on ESP3D file system
  • Using SPIFFS uploader, this plugin and install instructions is available on each ESP core - please refere to it or
  • Using embedded uploader (you may need to format SPIFFS using : [ESP710]FORMAT on ESP8266 first)
    if embedded uploader does not show up you can force it ti display using : http://your_IP_address?forcefallback=yes


  • Generate a binary using the export binary menu from Arduino IDE and upload it using ESP-WEBUI or embedded interface

⚠️Do not flash your Printer fw with ESP connected on Serial - it bring troubles, at least on DaVinci, but no issue if you update using web UI


Need more information about supported boards or wiring ?

Check the wiki

❓Any question ?

Check Wiki or Join the chat at Discord server

❗️Any issue/feedback ?

Check Wiki and FAQ If you still have issue: submit ticket
If it is not an issue join discussion here

ESP3D is used by :

This is for information only - I am not linked to these products, it is just a search result of a query using ESP3D as keyword. So I am not responsible of any usage of them.

⚠️ Do not use this repository for boards using custom firmware, you will lose several features.

  • More to come...


  • to @disneysw for bringing this module idea
  • to @lkarlslund for suggestion about independent reset using GPIO2
  • to Roy Cortes from for supporting and pushing me implementing great features
  • to all contributors, feedbacks owners and donations.

If you use ESP3D on your product, drop me a message so I can link your product page here.


Thanks goes to these wonderful people (emoji key):

Harald Wagener
Harald Wagener


Julien Staub
Julien Staub

John Bain
John Bain


Pascal de Bruijn
Pascal de Bruijn


Matthias Hryniszak
Matthias Hryniszak

T. Reepleks
T. Reepleks

Austin St. Aubin
Austin St. Aubin

Patrick Jos Pereira
Patrick Jos Pereira

John Little
John Little

david gauchard
david gauchard


Farkas Pter
Farkas Pter







David Buezas
David Buezas

This project follows the all-contributors specification. Contributions of any kind welcome!

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