LDO Leviathan V1.3 Control Board

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The LDO Leviathan 1.3 is a feature-rich control board designed for advanced CoreXY 3D printers, including Voron builds. Engineered for reliability and ease of integration, it combines powerful processing, multiple stepper drivers, and native support for CAN bus toolheads. With thoughtful layout and robust components, the Leviathan 1.3 offers smooth motion control and seamless expansion for demanding printer setups.

Features

• Supports both Klipper and (via new MCU) RRF firmware
• Uses an STM32H743ZIT6 microcontroller (upgraded from STM32F446) for improved performance
• Dual-supply design: one Vin for 24 V main board and another for 24-48 V stepper driver supply (polarity and over-voltage protected)
• On-board drivers: 5× TMC2209 (24 V) + 2× TMC5160 (24-48 V) with dedicated 12 V gate drive
• Four thermistor inputs
• Four fan outputs supporting tachometer feedback and selectable 5 V or 24 V via jumpers
• Single probe input (with selectable 5 V or 24 V via jumper) and a filament-sensor input (5 V tolerant)
• Neopixel output port for addressable LED strips
• Endstop support: 3× endstop inputs (5 V tolerant)
• Heater outputs: one hot-end channel (up to ~180 W / ~7.5 A) + one heatbed channel (up to ~240 W / ~10 A)
• Dimmable LED-strip output (constant current, ~350 mA) built-in
• Expansion ports: EXP1 & EXP2, plus an “Extension” port with multiple ADC, UART/SPI/CAN, GPIOs and 3.3 V/5 V/24 V supply taps
• Interfaces: USB-C for programming/firmware, CAN bus via MicroFit connector
• Direct Raspberry Pi mounting support: 5-pin JST-XH connector for Pi power (UART support) and mounting holes for RPi Zero 2W / RPi3/4
• Stepper driver cooling improved (better passive cooling design)
• Physical dimensions: 170 mm × 100 mm, with mounting-holes spacing of 160 mm × 90 mm

Specifications

• MCU: STM32H743ZIT6
• Stepper Drivers:
  • 5 × TMC2209 (24 V)
  • 2 × TMC5160 (24–48 V)
• Driver Supply: Dual input – 24 V logic / 24–48 V motor power
• Heater Outputs:
  • 1 × Hotend (≈ 7.5 A / 180 W @ 24 V)
  • 1 × Heated Bed (≈ 10 A / 240 W @ 24 V)
• Thermistor Inputs: 4
• Fan Outputs: 4, selectable 5 V or 24 V, tach support
• Probe Input: 1 (5 V or 24 V selectable)
• Filament Sensor Input: 1 (5 V tolerant)
• Endstop Inputs: 3
• Neopixel Header: Yes
• Dimmable LED Output: Constant current ~350 mA
• CAN Bus: Onboard, JST-style connector
• USB: USB-C
• Expansion: EXP1 / EXP2 + “Extension” header (ADC, UART/SPI/CAN, GPIO, 3.3 V/5 V/24 V)
• Raspberry Pi Power Header: 5-pin JST-XH
• Supported RPi Mounts: Zero 2W, Pi 3, Pi 4
• Firmware: Klipper / RRF supported
• Board Input Voltage: 24 V
• Motor Supply Voltage: 24 V – 48 V
• PCB Size: 170 mm × 100 mm
• Mounting Hole Spacing: 160 mm × 90 mm

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