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My-Cloner Rev A — Fans

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

This page documents the cooling fans used by the My-Cloner Rev A and their connection to the MKS Robin Nano V3.

The printer uses two 24 V cooling fans:

  • 1 × 4010 axial fan for hotend heatsink cooling
  • 1 × 5015 blower fan for part cooling

24 V Fans

The My-Cloner Rev A uses 24 V fans.

Earlier project documentation referenced 12 V fans. Those references are obsolete and must not be used for Rev A.

Cooling Architecture

The My-Cloner Rev A uses two independent cooling functions:

Function Fan Type Voltage
Hotend heatsink cooling 4010 axial fan 24 V DC
Part cooling 5015 blower fan 24 V DC

The MKS Robin Nano V3 provides two controllable fan outputs.

Board Output MCU Pin My-Cloner Assignment
FAN1 PC14 4010 hotend cooling — Rev A assignment
FAN2 PB1 5015 part cooling — Rev A assignment

The board-level pin mapping is confirmed by the official MKS Robin Nano V3 documentation and Klipper configuration.

The owner confirms the physical assignment above. Functional tests with the new configuration remain pending validation.

Hotend Cooling Fan

The hotend uses a:

4010 axial fan — 24 V DC

Its purpose is to cool the hotend heatsink and reduce heat creep.

Item Specification
Fan type Axial
Size 40 × 40 × 10 mm
Voltage 24 V DC
Function Hotend heatsink cooling
Board output FAN1
MCU pin PC14

This is the owner-reported Rev A connection; control behaviour remains pending validation.

Hotend Cooling

The hotend cooling fan is a critical part of the hotend thermal system.

The hotend should not be operated at extrusion temperatures without adequate heatsink cooling.

Part-Cooling Fan

The My-Cloner Rev A uses a:

5015 blower fan — 24 V DC

Its purpose is to provide controlled airflow to the printed part.

Item Specification
Fan type Radial blower
Size 50 × 50 × 15 mm
Voltage 24 V DC
Function Part cooling
Board output FAN2
MCU pin PB1

This is the owner-reported Rev A connection; control behaviour remains pending validation.

MKS Robin Nano V3 Fan Outputs

The MKS Robin Nano V3 provides two MOSFET-controlled fan outputs.

Output MCU Pin
FAN1 PC14
FAN2 PB1

The official generic Klipper configuration uses PC14 as the example primary fan output and lists PB1 as the second available output.

The My-Cloner does not need to preserve that exact functional assignment.

The physical wiring and final Klipper configuration must agree with each other.

Final Fan Assignment

The owner has confirmed the following physical Rev A assignments.

The Klipper sections below are planned for the new configuration:

Function Fan Board Output MCU Pin Klipper Section
Hotend cooling 4010 FAN1 PC14 [heater_fan hotend_fan]
Part cooling 5015 FAN2 PB1 [fan]

Rev A Assignment

The wiring is reported by the owner. Temperature-triggered hotend cooling, PWM response and airflow must be checked after the clean Klipper installation.

Klipper Configuration

The part-cooling fan will normally be controlled by Klipper using a [fan] section.

The final configuration will follow the selected Robin Nano output.

Example structure:

[fan]
pin: PB1

The hotend heatsink fan may use an automatically controlled Klipper configuration.

A typical structure is:

[heater_fan hotend_fan]
pin: PC14

The final parameters must be validated on the physical printer.

Example Only

The configuration above describes the intended structure only.

These are partial sections, not a complete validated printer.cfg.

Fan Polarity

Before connecting a fan, confirm:

  • Rated voltage
  • Positive conductor
  • Negative conductor
  • Connector orientation
  • Robin Nano output polarity

Do not assume wire colours are consistent between different fan manufacturers.

Verify Before Power-On

Reversed polarity may prevent the fan from operating and may damage some electronic fan assemblies.

Verify polarity before applying power.

Fan Control Validation

Each fan should be tested independently during bring-up.

4010 Hotend Fan

Verify that:

  1. The fan connected is the 24 V 4010 fan.
  2. The selected board output matches the Klipper configuration.
  3. The fan spins freely.
  4. Airflow is directed through the hotend heatsink.
  5. The fan activates at the intended hotend temperature.
  6. The fan stops or behaves as configured when the hotend cools.

5015 Part-Cooling Fan

Verify that:

  1. The fan connected is the 24 V 5015 blower.
  2. The selected board output matches the Klipper configuration.
  3. The blower spins freely.
  4. Airflow reaches the intended nozzle/part-cooling duct.
  5. Klipper can vary fan speed.
  6. 0% results in the expected off state.
  7. 100% results in full-speed operation.

PWM Testing

The part-cooling fan should be tested at several command levels.

Suggested validation points:

  • 0%
  • 25%
  • 50%
  • 75%
  • 100%

Observe:

  • Reliable fan startup
  • Stable operation
  • Noise or vibration
  • Airflow
  • Whether a minimum usable PWM value is required

Some fans may not start reliably at very low PWM values.

If necessary, the final Klipper configuration can be adjusted after physical testing.

Wiring Considerations

Fan wiring should:

  • Use secure connectors
  • Include suitable strain relief
  • Avoid contact with moving parts
  • Avoid hot surfaces
  • Allow normal toolhead movement
  • Match the selected board output
  • Remain clearly identifiable during maintenance

The toolhead fan cables should be routed with the rest of the moving hotend wiring without restricting X-axis movement.

Failure Considerations

Hotend Fan Failure

A failed hotend cooling fan may cause excessive heat transfer into the cold side of the hotend.

Possible symptoms include:

  • Heat creep
  • Filament softening above the melt zone
  • Extrusion jams
  • Unstable extrusion

If the hotend fan stops unexpectedly, printing should be stopped and the cause investigated.

Part-Cooling Fan Failure

A failed part-cooling fan normally does not create the same thermal risk to the hotend, but may significantly affect print quality.

Possible effects include:

  • Poor bridging
  • Poor overhangs
  • Reduced small-layer cooling
  • Dimensional problems on some materials

Validation Status

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

Item Status
4010 fan type Rev A assignment
4010 voltage Rev A assignment — 24 V
5015 fan type Rev A assignment
5015 voltage Rev A assignment — 24 V
FAN1 MCU pin Source confirmed — PC14
FAN2 MCU pin Source confirmed — PB1
4010 board-output assignment — FAN1 / PC14 Rev A assignment
5015 board-output assignment — FAN2 / PB1 Rev A assignment
Hotend fan Klipper section Planned
Part-cooling Klipper section Planned
PWM behaviour Pending validation
Fan airflow direction Pending validation