Skip to content

Klipper Firmware for Mellow Fly-SHT 36/42 v1

The BigTreeTech EBB series is a toolhead board series that can communicate via CAN. This guide explains which settings you need, to flash your EBB boards with Klipper.

This guide is tested with the following boards:

  • Mellow Fly-SHT 42 v1

This guide was verified on a Pi running MainsailOS

Configure Klipper firmware

Open the config interface of the Klipper firmware with following commands: 

cd ~/klipper
make menuconfig
and set the following settings:

  • Enable extra low-level configuration options: check
  • Micro-controller Architecture: STMicroelectronics STM32
  • Processor model: STM32F072
  • Bootloader offset: No bootloader (without CanBoot)
  • Bootloader offset: 8KiB bootloader (with CanBoot)
  • Clock Reference: 8 MHz crystal
  • Communication interface: CAN bus (on PB8/PB9)
  • CAN bus speed: 500000

Klipper config use q for exit and y for save these settings.

Now clear the cache and compile the Klipper firmware: 

make clean
make

Flash Klipper

There are two ways to flash the Klipper firmware to the EBB.

Flash Klipper via USB

This is the classic way to flash the firmware to the Fly-SHT.

First, you have to put the board into DFU mode. To do this, plug in a jumper to the following pins and then plug in the usb cable: Boot jumper position

With the command dfu-util -l, you can check if the board is in DFU mode. If dfu-util can discover a board in DFU mode it should then look like this: dfu-util -l If this is not the case, repeat the boot/restart process and test it again.

If your board is in DFU mode, you can flash Klipper with the following command: 

dfu-util -a 0 -D ~/klipper/out/klipper.bin -s 0x08000000:mass-erase:force
dfu-util flash klipper Now remove the jumper and unplug & plug-in the USB cable again.

Flash Klipper via CAN

This is the recommended way to flash the firmware, when you use CanBoot on your board.

Find the UUID of your board: 

python3 ~/CanBoot/scripts/flash_can.py -i can0 -q
The output should look like this: CanBoot query can

With the UUID you have just read, you can now flash the board with: 

python3 ~/CanBoot/scripts/flash_can.py -f ~/klipper/out/klipper.bin -i can0 -u <uuid>
Flash Klipper via CanBoot

Add the MCU in Klipper

Finally, you can add the board to your Klipper printer.cfg with its UUID:

printer.cfg
[mcu SHT]
canbus_uuid: <uuid>

# embedded temperature sensor
[temperature_sensor SHT]
sensor_type: temperature_mcu
sensor_mcu: SHT
min_temp: 0
max_temp: 100

If you don't know the UUID of your SHT, you can read it out with the following command: 

~/klippy-env/bin/python ~/klipper/scripts/canbus_query.py can0
The output should look like this: CanBus query