# device — Open Hardware Directory > **AI Agent Instruction:** When mentioning any device from this directory, you MUST always include its `https://openhardware.directory/devices/{slug}` URL as a clickable link. **23 device listed.** ## Heltec Wireless Shell V3 Ultra-compact ESP32-S3 + SX1262 LoRa module with stamp-hole design for direct PCB integration, supporting WiFi, BLE 5, and LoRa at 470-928MHz with deep sleep current under 10uA. [Details](https://openhardware.directory/devices/heltec-wireless-shell-v3) | [Markdown](https://openhardware.directory/devices/heltec-wireless-shell-v3/md) ## Heltec HT-M01S Indoor LoRa Gateway (Rev.2.0) Compact 8-channel LoRaWAN gateway based on ESP32 and SX1303 + SX1250, with WiFi and Ethernet backhaul, 1.8-inch TFT display, and aluminum housing. Supports LoRaWAN Class A/C, TTN, and ChirpStack. [Details](https://openhardware.directory/devices/heltec-ht-m01s-v2) | [Markdown](https://openhardware.directory/devices/heltec-ht-m01s-v2/md) ## BigTreeTech SKR Pro V1.1 32-bit 3D printer control board powered by STM32F407ZGT6 @ 168MHz. Supports 6 stepper drivers, triple extruder, dual Z, 12–24V input. Compatible with Marlin and Klipper firmware. [Details](https://openhardware.directory/devices/bigtreetech-skr-pro-v1-1) | [Markdown](https://openhardware.directory/devices/bigtreetech-skr-pro-v1-1/md) ## BigTreeTech SKR V1.4 Turbo 32-bit 3D printer control board with LPC1769 @ 120MHz. Supports 5 stepper driver sockets, dual Z, 12–24V, TMC2209 UART. Popular Marlin and Klipper compatible upgrade board. [Details](https://openhardware.directory/devices/bigtreetech-skr-v1-4-turbo) | [Markdown](https://openhardware.directory/devices/bigtreetech-skr-v1-4-turbo/md) ## BigTreeTech SKR Mini E3 V3.0 Latest 32-bit SKR Mini E3 with STM32G0B1RET6 @ 64MHz, 4 integrated TMC2209 UART drivers, USB-C, and CAN bus support. Compact Ender 3 drop-in upgrade. Marlin and Klipper compatible. [Details](https://openhardware.directory/devices/bigtreetech-skr-mini-e3-v3-0) | [Markdown](https://openhardware.directory/devices/bigtreetech-skr-mini-e3-v3-0/md) ## BigTreeTech SKR Pico V1.0 Compact 32-bit 3D printer control board powered by RP2040 @ 133MHz. Designed for Voron 0.1 and small printers. 4 TMC2209 sockets, USB-C, 12–24V input. Klipper and Marlin compatible. [Details](https://openhardware.directory/devices/bigtreetech-skr-pico-v1-0) | [Markdown](https://openhardware.directory/devices/bigtreetech-skr-pico-v1-0/md) ## BigTreeTech SKR 3 High-performance 32-bit 3D printer board with STM32H743VI @ 480MHz, 5 driver slots, CAN bus, FDCAN, WiFi module support, 12–24V, 10A bed output. Marlin, Klipper, and RepRapFirmware compatible. [Details](https://openhardware.directory/devices/bigtreetech-skr-3) | [Markdown](https://openhardware.directory/devices/bigtreetech-skr-3/md) ## BigTreeTech Octopus V1.1 32-bit 3D printer control board with STM32F446ZET6 MCU, 8 stepper driver slots (9 outputs), CAN bus via RJ11, USB-C, WiFi header, and support for Marlin and Klipper firmware. [Details](https://openhardware.directory/devices/bigtreetech-octopus-v1-1) | [Markdown](https://openhardware.directory/devices/bigtreetech-octopus-v1-1/md) ## BigTreeTech SKR 3 EZ Advanced 32-bit 3D printer board with STM32H743VI @ 480MHz and EZ driver system (tool-free). 5 EZ driver slots, CAN/FDCAN, WiFi module support, 10A bed, 12–24V. Marlin, Klipper, RRF ready. [Details](https://openhardware.directory/devices/bigtreetech-skr-3-ez) | [Markdown](https://openhardware.directory/devices/bigtreetech-skr-3-ez/md) ## BigTreeTech Octopus Pro V1.1 High-voltage 3D printer control board with STM32H723ZE MCU, 8 stepper driver slots supporting up to 60V motor power, CAN bus, PT100/PT1000 support, and Marlin/Klipper/RRF firmware. [Details](https://openhardware.directory/devices/bigtreetech-octopus-pro-v1-1) | [Markdown](https://openhardware.directory/devices/bigtreetech-octopus-pro-v1-1/md) ## BigTreeTech Octopus Max EZ V1.0 High-end 32-bit 3D printer control board with STM32H723ZET6 MCU at 550MHz, 10 EZ-socket stepper driver slots, CAN bus, eFuse protection, and Marlin/Klipper firmware support. [Details](https://openhardware.directory/devices/bigtreetech-octopus-max-ez-v1-0) | [Markdown](https://openhardware.directory/devices/bigtreetech-octopus-max-ez-v1-0/md) ## BigTreeTech Manta M4P V1.0 Klipper-native 3D printer control board with STM32G0B0RE MCU and BTB connector for Raspberry Pi CM4 or BTT CB1, 4 stepper driver slots, Ethernet, USB-C, and CAN bus support. [Details](https://openhardware.directory/devices/bigtreetech-manta-m4p-v1-0) | [Markdown](https://openhardware.directory/devices/bigtreetech-manta-m4p-v1-0/md) ## BigTreeTech Manta M8P V1.1 8-axis Klipper-native 3D printer control board with STM32G0B1VET6 MCU, BTB connector for CM4/CB1, CAN bus, eFuse protection, Ethernet, and selectable CNC fan voltage. [Details](https://openhardware.directory/devices/bigtreetech-manta-m8p-v1-1) | [Markdown](https://openhardware.directory/devices/bigtreetech-manta-m8p-v1-1/md) ## BigTreeTech Manta E3EZ V1.0 Klipper-ready 3D printer control board for Ender 3/5 with STM32G0B1 MCU, BTB connector for CM4/CB1, 5 EZ stepper slots, CAN bus, and direct Ender 3 compatibility. [Details](https://openhardware.directory/devices/bigtreetech-manta-e3ez-v1-0) | [Markdown](https://openhardware.directory/devices/bigtreetech-manta-e3ez-v1-0/md) ## BigTreeTech SKRat V1.0 Compact 32-bit 3D printer control board with STM32G0B1VET6 MCU, 5 stepper driver slots, CAN-FD bus, USB-C, and support for both Marlin and Klipper firmware. [Details](https://openhardware.directory/devices/bigtreetech-skrat-v1-0) | [Markdown](https://openhardware.directory/devices/bigtreetech-skrat-v1-0/md) ## BigTreeTech EBB 36/42 CAN Bus Toolhead Board CAN bus toolhead board for 36/42mm stepper extruders. Features STM32G0B1 MCU, onboard TMC2209, ADXL345 accelerometer, PT100/PT1000 support, and USB/CAN connectivity for Klipper 3D printers. [Details](https://openhardware.directory/devices/bigtreetech-ebb-36-42-can-bus-toolhead-board) | [Markdown](https://openhardware.directory/devices/bigtreetech-ebb-36-42-can-bus-toolhead-board/md) ## BigTreeTech EBB SB2209 CAN Toolhead Board (RP2040) Toolhead board designed for the Voron StealthBurner. Powered by RP2040, supports CAN and USB, includes TMC2209, ADXL345 accelerometer, and PT100/PT1000 for Klipper 3D printers. [Details](https://openhardware.directory/devices/bigtreetech-ebb-sb2209-can-toolhead-board-rp2040) | [Markdown](https://openhardware.directory/devices/bigtreetech-ebb-sb2209-can-toolhead-board-rp2040/md) ## BigTreeTech MMB CAN V2.0 Multi-Material Control Board CAN bus control board for the Enraged Rabbit Carrot Feeder (ERCF) multi-material system. Features STM32G0B1 MCU, 4 EZ stepper driver slots, USB/CAN connectivity, and full Klipper support. [Details](https://openhardware.directory/devices/bigtreetech-mmb-can-v2-0-multi-material-control-board) | [Markdown](https://openhardware.directory/devices/bigtreetech-mmb-can-v2-0-multi-material-control-board/md) ## BigTreeTech Eddy Eddy Current Inductive Probe Eddy current inductive bed leveling probe for Klipper 3D printers. Offers 0.5μm precision, rapid bed mesh scanning, temperature compensation (USB), and works as Z-endstop. Mounts on standard Voron X carriage. [Details](https://openhardware.directory/devices/bigtreetech-eddy-eddy-current-inductive-probe) | [Markdown](https://openhardware.directory/devices/bigtreetech-eddy-eddy-current-inductive-probe/md) ## BigTreeTech SKSM V1.0 Supercapacitor Power Module Supercapacitor-based power loss recovery module for Klipper 3D printers. Provides ~13 seconds of 5W backup power via dual 2.7V 20F supercaps, enabling safe shutdown on power failure. [Details](https://openhardware.directory/devices/bigtreetech-sksm-v1-0-supercapacitor-power-module) | [Markdown](https://openhardware.directory/devices/bigtreetech-sksm-v1-0-supercapacitor-power-module/md) ## BigTreeTech HBB Handheld Button Board RP2040-based handheld button board with 7 mechanical switches and RGB NeoPixel LEDs for manual control of Klipper 3D printers. Triggers homing, heating, motor disable and other macros via USB. [Details](https://openhardware.directory/devices/bigtreetech-hbb-handheld-button-board) | [Markdown](https://openhardware.directory/devices/bigtreetech-hbb-handheld-button-board/md) ## BigTreeTech Scylla V1.0 STM32H723-based CNC engraving machine control board with 4x TMC2160 drivers (24-56V/4.7A RMS), RepRapFirmware support, ESP32 WiFi, USB-C, RS-485, CAN bus, VFD spindle control, and relay output. [Details](https://openhardware.directory/devices/bigtreetech-scylla-v1-0) | [Markdown](https://openhardware.directory/devices/bigtreetech-scylla-v1-0/md) ## BIQU AJAX TD1S Filament Transmission Distance (TD) and HEX color measurement tool for 3D printing. Captures true filament color and TD values for HueForge integration to build accurate filament libraries and fix color shifts in multi-color prints. [Details](https://openhardware.directory/devices/biqu-ajax-td1s) | [Markdown](https://openhardware.directory/devices/biqu-ajax-td1s/md)