Electronics Assembly¶

My-Cloner Rev A — Pending validation

This chapter retains legacy mechanical assembly references. Housing fit, fasteners and illustrations require confirmation against the Rev A CAD and installed hardware. Placeholder images are not wiring references. Follow the Wiring & Electronics pages for Rev A assignments and complete Before First Power-On before energizing the machine.

This chapter covers the installation and connection of the My-Cloner Rev A electronics.

The Rev A electrical architecture uses:

MKS Robin Nano V3
5 × TMC2209 stepper drivers in UART mode
Raspberry Pi Zero 2 W
LM2596 24 V → 5 V converter
P.I.N.D.A. probe
MK3-style IR filament sensor
MKS TS35 V2.0 display
24 V hotend, heated bed and cooling fans

Rev A Validation Status

The board-level pin mapping is documented, but several My-Cloner-specific connections still require physical validation.

Do not infer a connection from older MK3S/Einsy assembly instructions.

Use the current I/O Map and the approved QElectroTech schematic as the electrical reference.

Before You Start¶

Disconnect the printer from mains power before installing or modifying electronics.

Confirm that you have reviewed:

Mains Voltage

The printer contains 230 V AC wiring.

Do not work on the mains side while the printer is connected to the power outlet.

Prepare the Electronics Housing¶

Use the current My-Cloner Rev A printed parts from the BOM:

Makerbase Board Housing
Makerbase Housing Lid
Makerbase Cable Clip
PSU Cover where applicable

Inspect the printed parts for cracks, warping or damaged mounting features before installation.

Do not use inherited electronics housings unless their compatibility with the Robin Nano V3 and Rev A cable routing has been explicitly confirmed.

Install the MKS Robin Nano V3¶

Mount the MKS Robin Nano V3 in the electronics housing using the mounting features defined by the current My-Cloner mechanical design.

Before tightening the board:

Confirm that the PCB is not under mechanical stress.
Ensure that no screw head or metallic part can short exposed PCB contacts.
Leave access to the stepper-driver sockets, power terminals, USB connector and required I/O connectors.
Confirm that the housing allows safe cable routing and strain relief.

Handle the board by its edges and observe normal ESD precautions.

Install the TMC2209 Drivers¶

The My-Cloner Rev A uses 5 × TMC2209 drivers.

Robin Nano Position	Rev A Function
X	X axis
Y	Y axis
Z	Left Z axis
E0	Extruder
E1	Right Z axis

The drivers are intended to operate in UART mode.

Driver Orientation

Verify the physical orientation and jumper configuration against the Robin Nano V3 and TMC2209 documentation before applying power.

Incorrect driver orientation can damage the driver or controller.

Final motor currents and StallGuard parameters are established during physical bring-up, not during mechanical assembly.

Install the Raspberry Pi Power Branch¶

The Raspberry Pi Zero 2 W is not powered from the Robin Nano V3 as the primary Rev A supply method.

The Rev A architecture is:

graph LR
    PSU[24 V DC] --> LM[LM2596]
    LM -->|5 V DC| PI[Raspberry Pi Zero 2 W]
    PI -->|USB| BOARD[MKS Robin Nano V3]

Before connecting the Raspberry Pi:

Power and adjust the LM2596 without the Pi connected.
Measure the output with a multimeter.
Confirm approximately 5 V DC with correct polarity.
Switch off power.
Only then connect the Raspberry Pi.

See Power Distribution for the full architecture.

Connect the Stepper Motors¶

Connect the motors according to the Rev A driver assignment:

Motor	Driver Position
X	X
Y	Y
Left Z	Z
Right Z	E1
Extruder	E0

Do not perform homing during this stage.

Motor direction, current and dual-Z behaviour must be validated individually during bring-up.

Connect the Hotend and Heated Bed¶

The source-confirmed controller channels are:

Function	Board Channel	MCU Pin
Hotend heater	HE0	`PE5`
Heated bed	H-BED	`PA0`
Hotend thermistor	TH1	`PC1`
Bed thermistor	TB	`PC0`

Thermistor Identification and Validation

The owner identifies the hotend thermistor as ATC Semitec 104GT-2. The bed uses an original NTC 100 kOhm sensor; its exact curve remains unconfirmed.

Confirm the installed sensors and their response before validating Klipper sensor_type settings.

Owner-reported heater specifications are 24 V / 40 W for the hotend and 24 V / 220 W for the heated bed. Physical heater tests, PID calibration and operating limits remain pending validation. See Heaters & Temperature Sensors.

Connect the Cooling Fans¶

The Robin Nano V3 exposes:

Output	MCU Pin
FAN1	`PC14`
FAN2	`PB1`

The My-Cloner Rev A uses:

4010 24 V hotend cooling fan
5015 24 V part-cooling blower

The owner-reported Rev A assignment is FAN1 / PC14 for the 4010 hotend cooling fan and FAN2 / PB1 for the 5015 part-cooling blower. Fan operation, PWM response and hotend cooling control remain pending validation; see Fans.

Do not assume a fan assignment from an older printer. The physical wiring and final Klipper configuration must agree.

Connect the P.I.N.D.A. Probe¶

The My-Cloner Rev A uses a P.I.N.D.A. probe, not a SuperPINDA or BLTouch.

The owner reports a three-wire P.I.N.D.A. V1 connected to Z- / PC8, GND and 5 V. This is a Rev A assignment; the electrical interface, Klipper trigger polarity and offsets remain pending validation. Confirm these against the I/O Map and the physical machine before Z motion.

Do Not Guess the Probe Input

The presence of Z-endstop and BLTouch-related board inputs does not identify the correct P.I.N.D.A. connection automatically.

Follow the validated Rev A I/O assignment before connecting the probe.

Connect the IR Filament Sensor¶

The Robin Nano V3 exposes two material-detection inputs:

Input	MCU Pin
MT_DET1	`PA4`
MT_DET2	`PE6`

The owner-reported Rev A assignment is the IR V0.4 filament sensor on MT_DET1 / PA4. Supply voltage, signal polarity and operation remain pending validation; see Display & Filament Sensor.

Before connecting the sensor, confirm:

Supply voltage
Ground
Signal pin
Connector orientation
Active-high / active-low behaviour

Connect the MKS TS35 V2.0¶

The MKS TS35 V2.0 is part of the Rev A hardware, but its final Klipper integration is still under validation.

Mainsail remains the primary user interface.

Do not connect the display solely by copying EXP1/EXP2 ribbon-cable instructions from another printer.

Use the current Display & Filament Sensor documentation once the TS35 interface has been validated.

Connect the Raspberry Pi to the Controller¶

Klipper host communication uses USB between:

Raspberry Pi Zero 2 W
MKS Robin Nano V3

Route the USB cable so that it:

Cannot enter the motion envelope
Is not sharply bent
Does not place stress on either USB connector
Is separated from high-current wiring where practical

Cable Management¶

Route all wiring so that:

X, Y and Z travel remain unrestricted
Moving cables have adequate service loops
Wires cannot touch the heated bed or hotend
Power and signal connectors cannot be pulled by axis movement
Cable bundles have appropriate strain relief
High-current wiring uses secure terminations
Cables remain identifiable for maintenance

Do not overtighten zip ties or clamps around wire insulation.

Power-Loss Recovery¶

Power Panic is not implemented in the My-Cloner Rev A.

Do not install a legacy Power Panic cable or board as part of the Rev A electronics assembly.

Any future power-loss-recovery implementation must be treated as a separate validated revision.

Pre-Power Electrical Check¶

Before applying mains power, verify:

Continue with:

Before First Power-On

Physical Bring-Up

Final validation of driver UART communication, motor direction/current, sensorless homing, P.I.N.D.A., fans, thermistors, heaters, filament sensor and TS35 is performed during the controlled Rev A bring-up process.