List of printers using this board

  • Prusa MK4
  • Prusa MK4S
  • Prusa Core One
  • Prusa Core One L

Technical Specification

PartValue
MCUSTM32F427 (ZIT6)
Flash2MiB
SRAM256KiB
Prusa Bootloader128KiB (with 512 byte offset)
Application Start Offset0x8020200
MCU Clock Frequency180 MHz
System Clock Reference12 MHz
USB FilesystemPA11 / PA12

Electrical Schematics


Firmware Dumps

These firmware files are direct binary dumps from the flash memory of the xBuddy board. They serve as a safety net, in case you accidentally do something stupid to brick your bootloader.
To flash these, you will need to enter DFU mode.

Prusa MK4/S


Option Bytes

Stock option configuration for the F427 MCU.

  {
  "deviceId" : 1049,
  "bitNameToValue" : {
    "RDP" : 170,
    "SPRMOD" : 0,
    "BOR_LEV" : 3,
    "BFB2" : 0,
    "WDG_SW" : 1,
    "nRST_STOP" : 1,
    "nRST_STDBY" : 1,
    "WRP0" : 1,
    "WRP1" : 1,
    "WRP2" : 1,
    "WRP3" : 1,
    "WRP4" : 1,
    "WRP5" : 1,
    "WRP6" : 1,
    "WRP7" : 1,
    "WRP8" : 1,
    "WRP9" : 1,
    "WRP10" : 1,
    "WRP11" : 1,
    "WRP12" : 1,
    "WRP13" : 1,
    "WRP14" : 1,
    "WRP15" : 1,
    "WRP16" : 1,
    "WRP17" : 1,
    "WRP18" : 1,
    "WRP19" : 1,
    "WRP20" : 1,
    "WRP21" : 1,
    "WRP22" : 1,
    "WRP23" : 1
  }
}

Sources


Last updated 07 Dec 2025, 23:11 CET . history