BTT Octopus Max EZ

BIGTREETECH Octopus MAX EZ V1.0 is a 32-bit 3D-printer control board for large Klipper or Marlin builds that need ten EZ driver channels, CAN, protected thermistor inputs, and flexible fan power. It is the upgraded Octopus-family board built around a 550 MHz STM32H723ZET6 ARM Cortex-M7 MCU, with pinless EZ driver sockets and onboard UART/SPI driver configuration.

Why this board over a standard Octopus

• 10 EZ driver sockets for high-axis-count CoreXY, toolchanger, multi-extruder, or large-format builds.
• Firmware-set UART/SPI for compatible BIGTREETECH EZ drivers — no driver-mode jumper maze.
• Board protection where mistakes happen: eFuse protection, protected thermistor circuits, replaceable fuse, and selectable 5V/12V/24V CNC fan voltage.
• Klipper-friendly expansion: CAN, SPI for accelerometer/input shaping, BLTouch/probe, RGB, filament sensor, PS-ON, TFT, and MINI12864 display headers.

Specifications

• Model: BIGTREETECH Octopus MAX EZ V1.0
• MCU: STM32H723ZET6, 32-bit ARM Cortex-M7 at 550 MHz
• Board size: 160 × 100 mm
• Input voltage: motherboard VIN 12V or 24V DC; heated bed input 12V or 24V DC
• Driver power: selectable 24V / HV up to 56V
• Stepper channels: 10 EZ driver sockets; UART/SPI driver modes
• Heaters: heated bed plus HE0, HE1, HE2, HE3 cartridge outputs
• Thermistors: 5× 100K NTC inputs; four channels selectable for PT1000 use
• Fans: FAN0–FAN3 2-wire CNC, FAN4–FAN6 4-wire CNC, plus 2× always-on 24V fan ports
• Firmware: Klipper or Marlin; firmware update by SD card or DFU
• PC interface: USB Type-C

Fitment and pairing

• Good fit for Voron, VZBot, large CoreXY, Cartesian, Delta, Kossel, Ultimaker-style, multi-extruder, and toolchanger projects that need more driver outputs than a smaller controller.
• Use EZ-format drivers such as the BTT EZ2209 Stepper Motor Driver for standard UART stepper channels or the BTT EZ5160 PRO Stepper Motor Driver when you need high-voltage SPI driver capability.
• Works well with a BTT MINI12864 V2.0 when you want a local screen.
• For CAN toolhead builds, pair the controller with a live toolhead board such as the EBB36 CAN Toolhead Board; the U2C CAN Interface Board is useful when you want a separate USB-to-CAN adapter.

Gotchas

• EZ drivers are not included. This board uses BIGTREETECH EZ-format pinless drivers; standard StepStick-style drivers are not the intended socket format.
• Check the fan-voltage jumpers before powering fans. The board supports 5V, 12V, and 24V fan rails, but the wrong jumper can kill the fan.
• The PT1000 jumper method is convenient, but BTT notes it is less accurate than a dedicated MAX31865-style RTD interface.