Features: [ Main control chip ]: Octopus V1.1 mainboard adopts ARM CortexM4 series STM32F446ZET6 32-bit microcontroller, with a frequency of 180MHz and512Kb Note: The input voltage only supports 24V and does not allow 12V. [CAN BUS]The BTT octopus control board supports CAN bus connections using Ethernetconnectors. This CAN bus connection allows for very easy expansion of the control board with other expansion boards. [6PWM Fans+2]The octopus mainboard provides up to 6 controllable PWM fans and 2 additional fans that do not require control, with the option of voltage ranging from 5V, 12V, or 24V. The BTT octopus also has 8 sockets for driver, making it great electronic product for demanding machines. [BTT octopus supports running Klipper andMarlin]. Supports firmware updates through USB (recommended) and DFUmode (advanced users). Updating through DFUmode directly sends firmware from the PC to the circuit board without the need to start the loader, which is not suitable for novice users. [Online/Offline Printing]Support the use of integrated USB-A ports for "printing from SDcard" and "printing through USBOTG". The USB-C supports pseudoserial ports that allow printing through USB. Specifications: Microcontroller Octopus V1.1 Mainrboard adopts ARM CortexM4 series STM32F446ZET6 32-bit Frequency of 180MHz and a 512Kb flash Note: The input voltage only supports 24V and does not allow 12V Support：runsKlipper/andMarlin Size：approx Mixed Package:Octopus V1.1 Control Board +BTT PI V1.2 Control Board with 8PCS TMC2209 V1.3 step Motor Driver Package Includes: 1PC OctopusV1.1 Control Board 1PC BTT PI V1.2 Control Board 8PCS TMC2209 V1.3 step Motor Driver note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurm