3D Printer Mainboard Bigtreetech SKR 3 EZ, Bigtreetech, motherboard for 3D printers (MPN BTT-21679)

Bigtreetech SKR 3 EZ is a mainboard created to control FDM/FFF 3D printers, providing coordinated management of stepper motors, heaters, thermistors and user interfaces. The board is intended for use as a replacement or upgrade controller for hobby and prosumer machines and supports standard motion control functions, driver expansion and integration of commonly used sensors and displays. SKR 3 EZ is suitable for users who need a modern, modular motherboard platform for custom firmware flashing and incremental hardware improvements.

Advantages

The SKR 3 EZ offers a compact layout with accessible ports for stepper drivers, temperature sensors and peripherals, enabling straightforward wiring and component replacement. It supports common motion-control features and is compatible with widely used firmware platforms, which simplifies customization and tuning of print behavior. The board’s design emphasizes modularity and expandability so users can add or swap stepper drivers, displays and auxiliary sensors without replacing the entire control system.

Suitable for

• Replacing factory controller boards in hobby and prosumer 3D printers
• DIY upgrades to add improved stepper drivers or additional axes
• Custom firmware development and testing for motion and temperature control
• Integration with external displays, filament sensors and bed-leveling probes

Key specifications

• Mainboard type: single-board controller for FDM/FFF 3D printers
• Connectivity: multiple stepper driver sockets and peripheral headers for displays, thermistors and endstops
• Motion control: support for multi-axis coordination and common stepper driver modules
• Sensor interfaces: thermistor and endstop inputs compatible with standard printer components
• Power handling: designed for typical desktop 3D printer power supplies and heater circuits
• Firmware: compatible with mainstream open-source 3D printer firmware platforms

How to use

Install the SKR 3 EZ into the printer by disconnecting the original controller, mounting the board in the existing enclosure or designated location and reconnecting power, stepper motors, heaters, thermistors, endstops and any displays according to the board’s pinout documentation. After hardware connections, load and configure compatible firmware that matches your printer’s kinematics, stepper driver types and thermistor parameters. Verify basic functions such as axis movement, temperature readings and heater control before initiating a full print.

Usage recommendations

Use properly rated wiring and secure connectors when installing the mainboard. Before powering the system, double-check polarity and power connections for the heaters and power supply. Calibrate motion and temperature settings in firmware after installation and perform initial tests at low temperatures and speeds to confirm correct operation.