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Tip
  • The MMU provides Katapult firmware for USB and CAN connections. You can flash it yourself if needed.
  • The MMU comes pre-flashed with Katapult firmware for CAN connection at a rate of 1M.
  • Katapult Firmware Flashing

Firmware Flashing Instructions

  • The MMU can connect to the host computer using RS232, CAN, or USB.
  • For RS232 and CAN connections, an XT30(2+2)-F cable is required. For USB, a TYPE-C data cable with data transfer capability is needed.
  • Below is the style of the XT30(2+2)-F data cable.
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Important Notes
  • Flashing the mainboard firmware requires using Katapult to flash Klipper.
  • If you are certain the mainboard already has Katapult flashed, you do not need to perform the final step of flashing Katapult firmware.
  • You can quickly press the reset button twice to see if an LED on the mainboard starts blinking. If it does, it indicates the mainboard has entered the Katapult firmware.

How to Determine Which Firmware You Need​

  • The MMU can connect to the host computer using the following methods:
  • CAN Firmware Flashing
    • Advantages: If Katapult firmware is flashed, firmware updates can be performed without touching the mainboard, and it supports bus connections.
    • Disadvantages: May cause errors such as homing timeouts when used with KlipperScreen.
    • Note: If using CAN, ensure the host computer supports CAN and that it is paired with a UTOC or a mainboard flashed with bridge firmware.
  • RS232 Firmware Flashing
    • Advantages: No special software is required for use; communication is reliable and stable.
    • Disadvantages: Re-flashing firmware requires entering manual DFU mode or double-clicking RST to enter Katapult for updates.
    • Note: Requires pairing with G2T or UTOR to function.
  • USB Firmware Flashing
    • Advantages: If Katapult firmware is flashed, firmware updates can be performed without touching the mainboard. If using an SD card or DFU flashing, updates must follow the original method. Communication is reliable and stable.
    • Disadvantages: Multiple USB devices may affect data transmission.

Katapult Firmware Explanation​

Tip

Katapult was originally named CanBoot and later renamed to Katapult.

  • Katapult firmware is a type of bootloader that can be used in conjunction with Klipper. After flashing via methods like DFU, the firmware can be updated with a single command.
  • Advantages: Quickly double-click the reset button or power off twice rapidly to enter Katapult firmware, at which point the motherboard's LED will blink.
  • Katapult firmware can only be used to flash firmware and cannot connect to Klipper!!!
  • Katapult firmware supports three methods for connecting to the host computer, with each method's firmware being independent of the others:
    • CAN connection
      • Advantages: After compiling the Klipper firmware, the firmware can be updated directly using commands, with strong anti-interference capabilities.
      • Disadvantages: The firmware compilation rate must be known in advance.
    • RS232 connection
      • Advantages: After compiling the Klipper firmware, the firmware can be updated using commands, with very strong anti-interference capabilities.
      • Disadvantages: Firmware cannot be updated with a single command; manual entry into Katapult firmware is required.
    • USB connection
      • Advantages: After compiling the Klipper firmware, the firmware can be updated directly using commands.
      • Disadvantages: Long data cables are prone to interference, which may cause disconnections.
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