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My-Cloner Rev A — Power Distribution

This page describes the power architecture used by the My-Cloner Rev A.

The printer uses:

  • 230 V AC mains input
  • 24 V DC main power
  • 5 V DC auxiliary power for the Raspberry Pi

Mains Voltage

The AC input section of the printer operates at hazardous mains voltage.

Disconnect the printer from the power outlet before working on the AC wiring.

If you are not familiar with mains wiring and protective-earth practices, seek assistance from a qualified person.

Power Architecture

The My-Cloner Rev A uses the following power path:

graph TD
    A[230 V AC] --> B[IEC C14 Inlet]
    B --> C[Integrated Switch + Fuse]
    C --> D[Mean Well LRS-350-24]

    D -->|24 V DC| E[MKS Robin Nano V3]
    D -->|24 V DC| F[LM2596]

    F -->|5 V DC| G[Raspberry Pi Zero 2 W]

    E --> H[Stepper Motors and TMC2209 Drivers]
    E --> I[Hotend Heater]
    E --> J[Heated Bed]
    E --> K[Cooling Fans]
    E --> L[Sensors and Control Electronics]

AC Input

IEC C14 Inlet

The My-Cloner Rev A uses an IEC C14 mains inlet with integrated switch and fuse.

The AC input section provides:

  • Mains connection
  • Main power switch
  • Overcurrent protection through the fuse
  • Protective-earth connection

The intended mains supply is:

230 V AC

Voltage Selection

The Mean Well LRS-350-24 supports selectable input-voltage ranges.

Before connecting the printer to mains power, verify that the power supply input selector is set correctly for the local mains voltage.

For the standard My-Cloner Rev A configuration described here, the intended input is 230 V AC.

AC Connections

The basic AC wiring is:

graph LR
    IEC[IEC C14 Inlet]

    L[Live - L]
    N[Neutral - N]
    PE[Protective Earth - PE]

    SW[Switch + Fuse]
    PSU_L[PSU Live Input]
    PSU_N[PSU Neutral Input]
    PSU_PE[PSU Earth Terminal]

    IEC --> L
    IEC --> N
    IEC --> PE

    L --> SW
    SW --> PSU_L

    N --> PSU_N
    PE --> PSU_PE

The switched and fused live conductor supplies the power supply.

The neutral conductor connects directly to the power supply neutral input.

Protective earth must be connected to the power supply earth terminal and to any exposed conductive parts that require protective grounding.

Protective Earth

Protective earth is a safety connection and must not be omitted.

Do not use the DC negative conductor as a substitute for protective earth.

Main Power Supply

The My-Cloner Rev A uses:

Mean Well LRS-350-24

Parameter Value
Output voltage 24 V DC
Maximum output current 14.6 A
Rated output power 350.4 W
Intended AC input 230 V AC

The power supply provides the main 24 V DC rail for the printer.

24 V Distribution

The 24 V rail supplies the main printer systems.

Load Voltage
MKS Robin Nano V3 24 V DC
Stepper motors / drivers 24 V DC
Heated bed 24 V DC
Hotend heater 24 V DC
4010 hotend fan 24 V DC
5015 part-cooling fan 24 V DC
LM2596 converter 24 V DC input

The final current consumption of each branch will be validated during the Rev A bring-up process.

Raspberry Pi Power

The Raspberry Pi Zero 2 W is powered through a dedicated DC-DC converter.

The converter used by the My-Cloner Rev A is:

LM2596 step-down converter

Its function is:

graph LR
    A[24 V DC] --> B[LM2596]
    B -->|5 V DC| C[Raspberry Pi Zero 2 W]

Adjust Before Connecting

Do not connect the Raspberry Pi until the LM2596 output voltage has been measured and adjusted correctly.

Verify the output with a multimeter before connecting the Raspberry Pi.

The target output is:

5 V DC

Raspberry Pi Ground Reference

The Raspberry Pi 5 V supply and the printer controller must share the appropriate DC ground reference for reliable communication.

The final grounding arrangement must follow the My-Cloner electrical schematic.

Controller Power

The MKS Robin Nano V3 receives power from the main 24 V DC supply.

The board distributes power internally to:

  • Stepper drivers
  • Heater outputs
  • Fan outputs
  • Logic circuits
  • Sensor interfaces

The My-Cloner Rev A does not use the Robin Nano V3 as the primary 5 V power source for the Raspberry Pi.

The Raspberry Pi uses the dedicated LM2596 converter instead.

Heater Power

Hotend Heater

The hotend heater is powered from the 24 V system and controlled by the Robin Nano V3.

Item Value
Heater type V6-style cartridge
Voltage 24 V DC
Controller output HE0
MCU control pin PE5
Heater power TBD

The heater is switched by the controller board MOSFET.

Heated Bed

The heated bed is also powered from the 24 V rail.

Item Value
Bed size 230 × 230 mm
Voltage 24 V DC
Controller output H-BED
MCU control pin PA0
Heater power TBD

High Current Load

The heated bed is one of the highest-current loads in the printer.

Use suitable wire gauge, connectors and terminal preparation for the expected current.

Fan Power

The My-Cloner Rev A uses 24 V fans.

Fan Voltage Function
4010 Axial Fan 24 V DC Hotend heatsink cooling
5015 Blower 24 V DC Part cooling

The final FAN1 / FAN2 assignment on the Robin Nano V3 is still pending validation.

Do Not Use Legacy 12 V Fans

Earlier My-Cloner documentation referenced 12 V fans.

Those references are obsolete for Rev A.

The current My-Cloner Rev A uses 24 V fans.

DC Ground

All low-voltage systems must use a consistent DC ground reference.

The 24 V negative rail is shared by the controller and the LM2596 input.

The LM2596 output provides the 5 V supply and ground for the Raspberry Pi.

The final wiring arrangement must ensure that:

  • DC return paths are correctly sized
  • Ground connections are secure
  • High-current loads do not share weak connections with sensitive electronics
  • Protective earth remains separate from normal DC return wiring except where specifically required by the approved electrical design

The preferred architecture is:

graph TD
    PSU[Mean Well LRS-350-24]

    BOARD[MKS Robin Nano V3]
    LM[LM2596]
    PI[Raspberry Pi Zero 2 W]

    HE0[HE0]
    BED[H-BED]
    FAN1[FAN1]
    FAN2[FAN2]
    DRIVERS[Stepper Drivers]

    HOTEND[Hotend Heater]
    HEATEDBED[Heated Bed]
    FAN_A[Cooling Fan]
    FAN_B[Cooling Fan]
    MOTORS[Stepper Motors]

    PSU -->|24 V DC| BOARD
    PSU -->|24 V DC| LM
    LM -->|5 V DC| PI

    BOARD --> HE0
    BOARD --> BED
    BOARD --> FAN1
    BOARD --> FAN2
    BOARD --> DRIVERS

    HE0 --> HOTEND
    BED --> HEATEDBED
    FAN1 --> FAN_A
    FAN2 --> FAN_B
    DRIVERS --> MOTORS

Wire and Connector Requirements

Wire size must be selected according to:

  • Maximum expected current
  • Cable length
  • Connector rating
  • Ambient temperature
  • Mechanical protection
  • Applicable electrical standards

Particular attention should be given to:

  • AC mains wiring
  • Heated bed wiring
  • PSU output wiring
  • Controller power input
  • Heater connections

Terminal Preparation

Do not place loose stranded wire directly under high-current screw terminals.

Use appropriate ferrules or other approved termination methods where required.

Fuse Protection

The IEC inlet includes a fuse.

The final fuse rating must be selected according to:

  • Printer maximum power
  • Input voltage
  • Power supply characteristics
  • Applicable safety requirements

Fuse Rating Pending Final Validation

The exact recommended fuse rating for the My-Cloner Rev A must be confirmed before release.

Do not replace a fuse with a higher-current rating without verifying the electrical design.

Power-On Validation

Before the controller, Raspberry Pi or heaters are connected, the power system should be validated in stages.

Recommended sequence:

  1. Verify the IEC inlet wiring.
  2. Verify protective earth continuity.
  3. Confirm the PSU voltage-selector position.
  4. Inspect all AC terminal connections.
  5. Power the PSU without sensitive electronics connected where appropriate.
  6. Measure the 24 V output.
  7. Confirm correct polarity.
  8. Connect the LM2596.
  9. Adjust the LM2596 output to 5 V.
  10. Verify the 5 V output with a multimeter.
  11. Disconnect mains power.
  12. Connect the controller and Raspberry Pi only after the voltages are confirmed.

Power Off Before Rewiring

Always disconnect mains power before changing wiring or moving connections.

Validation Status

Item Status
IEC C14 inlet Defined
230 V AC architecture Defined
Mean Well LRS-350-24 Defined
24 V main rail Defined
LM2596 24 V → 5 V Defined
Raspberry Pi Zero 2 W supply Defined
Hotend heater power TBD
Heated bed power TBD
Final fuse rating Pending validation
Wire gauges Pending validation
Final grounding layout Pending schematic validation
Physical power-on test Pending

For the complete electrical architecture:

System Overview

For controller connections:

Controller Board

For the complete signal mapping:

I/O Map

For heater wiring:

Heaters & Temperature Sensors

For first power-on checks:

Before First Power-On