My-Cloner Rev A — Electrical System Overview¶

See Owner-Reported Hardware and Test Status for the confirmed V3.0 hardware, connections and remaining checks.

This page provides a high-level overview of the electrical architecture used by the My-Cloner Rev A.

The goal is to show how the main electrical subsystems are connected before moving into the detailed wiring pages.

System Architecture¶

The My-Cloner Rev A uses a 24 V DC electrical architecture.

The main electrical path is:

graph TD
    A[230 V AC] --> B[IEC C14 Inlet]
    B --> C[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]

    G -->|USB| E

    E --> H[5 x TMC2209 Drivers]
    H --> I[Stepper Motors]

    E --> J[Hotend Heater]
    E --> K[Heated Bed]
    E --> L[Cooling Fans]

    M[Thermistors] --> E
    N[P.I.N.D.A. V1] -->|Z- / PC8| E
    O[IR V0.4 Filament Sensor] -->|MT_DET1 / PA4| E
    E -.->|Pending validation| P[MKS TS35 V2.0]

Main Electrical Subsystems¶

The My-Cloner Rev A electrical system is divided into the following main subsystems:

Subsystem	Main Components	Purpose
AC Input	IEC C14 inlet, switch, fuse	Connects the printer to 230 V AC mains
DC Power Supply	Mean Well LRS-350-24	Converts 230 V AC to 24 V DC
Main Controller	MKS Robin Nano V3	Controls printer hardware
Klipper Host	Raspberry Pi Zero 2 W	Runs Klipper host software and Mainsail
5 V Supply	LM2596	Converts 24 V DC to 5 V DC for the Raspberry Pi
Motion	5 × NEMA17 motors + TMC2209 drivers	Controls X, Y, dual Z and extrusion
Heating	Hotend heater + heated bed	Provides extrusion and build-surface heating
Temperature Monitoring	Hotend and bed thermistors	Provides temperature feedback
Cooling	4010 + 5015 fans	Hotend and part-cooling
Z Sensing	P.I.N.D.A. probe	Z reference and bed probing
Filament Detection	MK3-style IR sensor	Detects filament presence
Local Display	MKS TS35 V2.0	Local interface — integration: Pending validation
Web Interface	Mainsail	Primary printer control interface

Power Domains¶

The My-Cloner uses two main DC voltage domains:

24 V DC¶

Used by:

MKS Robin Nano V3
Heated bed
Hotend heater
4010 hotend fan
5015 part-cooling fan
Stepper motors / drivers

5 V DC¶

Used by:

Raspberry Pi Zero 2 W

The 5 V supply is generated by an LM2596 DC-DC converter connected to the 24 V system.

Raspberry Pi Power

The Raspberry Pi must receive a stable 5 V supply.

The LM2596 output voltage must be adjusted and verified before connecting the Raspberry Pi.

Motion Architecture¶

The My-Cloner uses two main DC voltage domains:

Function	Motor	Driver Position
X Axis	NEMA17	X
Y Axis	NEMA17	Y
Left Z Axis	NEMA17	Z
Right Z Axis	NEMA17	E1
Extruder	NEMA17 Pancake	E0

All five positions use TMC2209 stepper drivers in UART mode.

The My-Cloner Rev A uses TMC2209 sensorless homing on the X and Y axes.

The sensorless-homing architecture is a Rev A assignment. Driver current, StallGuard sensitivity, homing speed and repeatability remain pending physical validation.

Z referencing is assigned to P.I.N.D.A. V1 on Z- / PC8. Trigger polarity, offsets and operation with the new configuration remain pending validation.

Heating Architecture¶

The My-Cloner Rev A includes two heating systems:

Heater	Voltage	Controller Output
Hotend	24 V DC	HE0
Heated Bed	24 V DC	H-BED

Temperature feedback is provided by:

Hotend thermistor
Heated bed thermistor

The exact thermistor models must match the Klipper configuration.

Cooling Architecture¶

The printer uses two 24 V cooling devices:

Device	Function
4010 Axial Fan	Hotend heatsink cooling
5015 Blower	Part-cooling

The owner reports FAN1 / PC14 for the 4010 hotend fan and FAN2 / PB1 for the 5015 part-cooling fan. Operation with the new configuration remains pending validation.

Control Architecture¶

The My-Cloner uses Klipper with a separate host and MCU architecture.

graph LR
    A[Raspberry Pi Zero 2 W] -->|USB| B[MKS Robin Nano V3];
    B --> C[STM32F407 MCU];
    C --> D[Printer Hardware];

The Raspberry Pi handles:

Klipper host processing
Mainsail web interface
Network access
High-level printer control

The MKS Robin Nano V3 handles:

Step generation
Heater control
Fan control
Sensor inputs
Motor-driver communication
Real-time hardware control

User Interfaces¶

Primary Interface¶

The primary user interface is:

Mainsail

Mainsail runs through the Raspberry Pi Zero 2 W and provides browser-based printer control.

Local Display¶

The My-Cloner Rev A hardware includes an:

MKS TS35 V2.0

Its final integration with the Klipper-based architecture is pending validation.

Sensors¶

The current Rev A sensor architecture includes:

Sensor	Function	Status
P.I.N.D.A. V1	Z probing / Z reference	Rev A assignment
Hotend Thermistor	ATC Semitec 104GT-2, owner-identified	Rev A assignment
Bed Thermistor	Original Ender 3 NTC 100 kΩ; exact curve TBD	Pending validation
IR Filament Sensor	Filament detection	Rev A assignment
X Sensorless Homing	X-axis homing	Rev A assignment
Y Sensorless Homing	Y-axis homing	Rev A assignment

Safety Architecture¶

The main electrical safety elements include:

IEC C14 inlet
Integrated mains switch
Fuse
Mean Well enclosed power supply
Protective earth connection
Klipper thermal protection
Temperature monitoring
Controlled heater outputs

Mains Voltage

The AC side of the printer operates at mains voltage.

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

Documentation Flow¶

Use the following pages for more detailed information:

Validation Status¶

See Status Definitions. Design assignments and source mappings do not establish physical validation.

Some elements of this architecture are already defined at design level, while others still require physical validation.

The following items are still pending:

P.I.N.D.A. PC8 input polarity, offsets and repeatability
FAN1 / FAN2 control behaviour, PWM and airflow
IR V0.4 sensor polarity and runout behaviour on MT_DET1 / PA4
TMC2209 current values
X/Y sensorless homing thresholds
Motor direction and polarity
Bed thermistor curve and both temperature readings under the new configuration
MKS TS35 V2.0 Klipper integration

These items will be updated during the My-Cloner Rev A bring-up process.