Open Marlin project in PlatformIO
Install VSCode and install the PlatformIO extension.
Download the latest Marlin release zip and extract the contents.
Open VSCode and select the PlatformIO extension from the Activity Bar.
Select “Open Project” from the PlatformIO Quick Access screen and choose the Marlin folder that you downloaded.
Configure environment and header files
Now open the platformio.ini file and change the default_envs value to match your printer board.
Examples of configurations I have used:
default_envs = STM32F103RET6_creality //Ender-3 Pro v4.2.2 board AKA "Ender 3 Pro v1.5"
default_envs = STM32F103RC_btt_USB_maple //BIGTREETECH SKR Mini E3 V2.0
Download the latest Marlin configuration zip and extract the folder that matches your printer board. Examples of configurations I have used:
config/examples/Creality/Ender-3 Pro/CrealityV422/
config/examples/Creality/Ender-3 Pro/BigTreeTech SKR Mini E3 2.0/
Move the header (.h) files you just extracted to the Marlin-X.X.X.X/Marlin folder.
(Yes, that means overwriting Configuration.h, Configuration_adv.h, and Version.h).
If you’re going to be using Octoprint, enable host action commands:
Uncomment #define HOST_ACTION_COMMANDS in Configuration_adv.h.
Build and flash the firmware
After saving the changes to platformio.ini and placing the configuration files in the Marlin-X.X.X.X/Marlin folder, we’re ready to build:
With PlatformIO project open, Select “Build All” from the Project Tasks listed under the VSCode Side Bar.
If your build succeeds, you should see the path to the created firmware.bin file printed above the “SUCCESS” line.
Copy firmware.bin to the root of an SD card.
Place the SD card into the printer slot and power cycle the printer to flash the firmware.