My-Cloner Rev A — Electrical System Overview¶

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.] --> E
    O[IR Filament Sensor] --> E
    E --> 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 under 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 Rev A uses five stepper motors:

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.

X and Y are planned to use TMC2209 sensorless homing.

Z referencing is performed using the P.I.N.D.A. probe.

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 final FAN1/FAN2 assignment on the MKS Robin Nano V3 is still 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 still under validation.

Sensors¶

The current Rev A sensor architecture includes:

Sensor	Function	Status
P.I.N.D.A.	Z probing / Z reference	Defined
Hotend Thermistor	Hotend temperature	Exact model TBD
Bed Thermistor	Bed temperature	Exact model TBD
IR Filament Sensor	Filament detection	Defined
X Sensorless Homing	X-axis homing	Planned
Y Sensorless Homing	Y-axis homing	Planned

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¶

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. board input assignment
FAN1 / FAN2 functional assignment
IR filament sensor input assignment
TMC2209 current values
X/Y sensorless homing thresholds
Motor direction and polarity
Exact thermistor models
MKS TS35 V2.0 Klipper integration

These items will be updated as the My-Cloner Rev A moves through the physical bring-up process.