MKS SERVO42D NEMA17 Closed Loop Stepper Motor Driver Kit - CAN Bus Version With 48mm Motor

Specifications

• Model: MKS SERVO42D (CAN Version) + 42-48 Motor
• Input Voltage: 12V - 24V DC
• Max Current: 2A (Peak)
• Microstepping: Up to 1/256
• Encoder: 14-bit Magnetic Encoder (16384 positions)
• Processor: 32-bit ARM Cortex-M0+ (108MHz)
• Communication Interface: CAN Bus (Supports daisy chaining)
• Holding Torque: ~52N.cm (integrated motor)
• Display: Integrated 0.96 inch OLED for parameter tuning (optional usage)

Applications

• High-End 3D Printers: Perfect for X/Y axis on CoreXY machines (Voron 2.4, Trident) to prevent layer shifts at high accelerations.
• Robotic Arms: Reduces wiring complexity significantly through CAN Bus daisy-chaining while providing necessary torque feedback.
• CNC Plotters: Ensures absolute positioning accuracy for fine-detail work.
• Education/Research: Ideal for learning FOC control and CAN communication protocols.

Project Evolution

       From Open Loop to Industrial Control

• Prerequisites: You should be comfortable with basic 3D printer firmware (Klipper/Marlin) or stepper motor control logic.
• The Upgrade: Moving from a standard A4988/TMC2209 driver to the SERVO42D CAN unlocks Force Feedback (detecting collisions) and High-Speed Reliability. You also gain the ability to chain motors, freeing up ports on your mainboard.
• Effort Level: Intermediate/Advanced. Requires configuring CAN bitrate and node IDs.
• Probots Tech-Bridge: Our team recommends using a high-quality USB-to-CAN adapter (like U2C) for reliable communication with your host computer (Raspberry Pi/PC).

Virtual Technician: Wiring & Safety

• ⚠️ Voltage Warning: Ensure your power supply does not exceed 24V. Reverse polarity will permanently damage the driver board.
• CAN Termination: If this is the last node in your CAN bus chain, ensure the termination resistor jumper is set correctly (120Ω).
• Pinout Check: Always double-check the VCC and GND wiring. The CAN H and CAN L lines must be twisted pairs to prevent interference.

Package Contents:

• 1 x MKS SERV042D CAN MT 48MM LONG
• 1 x MKS APT
• 1 x Cable XH2.54-6Pin 100cm (single end tinned 5mm)
• 1 x Mini jumper 2.0 PINHD-2X1 (Closed,Height 5.0MM)

Frequently Asked Questions (FAQ)

• Does this kit include the motor?
  Yes, this listing is for the complete kit: The SERVO42D driver board mounted on a 48mm NEMA17 motor.
• What is the advantage of CAN Bus over UART/DIR/STEP?
  CAN Bus allows daisy-chaining (connecting one motor to the next) and provides much higher noise immunity and data speed, ideal for long wire runs.
• Does this work with Klipper firmware?
  Yes, MKS SERVO42D is fully supported in Klipper via the appropriate CAN bridge configuration.
• Can I use this without CAN Bus (Pulse/Dir mode)?
  This specific "CAN Version" is optimized for CAN communication. For Pulse/Direction control, use the standard SERVO42D version.
• What voltage should I use?
  We recommend a stable 24V DC power supply for optimal torque and speed performance.
• Does it require a special mainboard?
  No, since it uses CAN, you only need a CAN interface (or USB-CAN adapter) on your controller (like Raspberry Pi or Octopus board).
• How do I set the CAN ID?
  The CAN ID and bit rate can be configured via the onboard menu using the buttons and OLED screen.
• Is the encoder absolute or relative?
  It uses a 14-bit magnetic encoder which provides absolute position within one rotation, but treats multi-turn as relative tracking.
• What happens if the motor stalls?
  The driver will detect the position error and attempt to correct it by increasing current. If it fails, it can trigger an error flag.
• Can I use this for the Extruder motor?
  Yes, the closed-loop control is excellent for extruders to prevent skipping during high-flow printing.
• How loud is this motor?
  It is extremely quiet due to FOC (Field Oriented Control), often quieter than TMC2209 in StealthChop mode.
• Do I need to calibrate the motor?
  The unit comes pre-calibrated, but you can run a calibration routine via the menu if you disassemble or change the magnet.
• What is the max speed?
  It can reach up to 2000-3000 RPM depending on load and voltage, significantly faster than open-loop steppers.
• Does it generate heat?
  The motor will run cooler than open-loop steppers because current is dynamically adjusted based on load, rather than constant peak current.
• What is the holding torque?
  The 48mm motor provides approximately 52N.cm of holding torque.
• Can I use 12V?
  Yes, 12V works, but high-speed performance will be lower compared to 24V.
• Is the screen removable?
  The OLED screen is soldered to the board but can be turned off to save power.
• What connectors does it use?
  It typically uses XH2.54 connectors for Power and CAN signals.
• Does it support infinite rotation?
  Yes, it functions like a standard stepper motor with infinite rotation capability.
• Is the firmware open source?
  Yes, MKS provides the source code on their GitHub for customization.