Filling the Cooling Circuit

Do not use water alone or any other coolant mixture not authorized by AON3D. Do not mix or dilute the provided coolant, unless otherwise indicated on the coolant bottle or instructions sent from AON3D. Improper coolant can lead to potential failures, including galvanic corrosion, algal growth, scale formation, and polymeric degradation. Any of these issues will negatively affect the performance of the cooling system and can lead to catastrophic component failure.

The AON-M2 2020 is equipped with a different style of pump from the original AON-M2 model. Instructions for both systems can be found on this page:

AON-M2 2020 Instructions

Required Tools & Equipment

  • A coin or large flathead screwdriver
  • 3 bottles of coolant
  • Funnel (included with your machine)
  • A bowl or jug (to catch excess coolant)

The cooling system takes about 1.5L of coolant to fill. You will have additional coolant left after filling the cooling system. Keep this to top up the system over time.

Preparation

Note the safety warnings from the supplier and use any necessary personal protective equipment (PPE) while handling the coolant.

The coolant bottles come with a spout assembly to help pour the coolant cleanly. Part of this assembly is a small tube packaged with the coolant. The tube is not recommended for this procedure, as you will need to pour the coolant fairly quickly. Keep the tube on hand as it will be useful for topping up the cooling system in the future.

Koolance bottle and tube

  1. To assemble the spout, first remove the cap and carefully pop out the center. Keep this center piece if you want to reseal the bottle later!

    Pop the center of the cap

  2. Take out the rubber nozzle and place it upright on the bottle opening. Secure it in place with the cap.

    Rubber nozzle in place

Before you begin filling the system, note the location of key components pictured below: pump cap, pump power connector, and radiator bleed valve.

Cooling system pump and radiator with labels

Filling the Pump Reservoir and Radiator

  1. Turn off the pump power by separating the male and female connectors. The pump power connector is shown below.

    Pump power connector

  2. Use the coin or large flathead screwdriver to remove the cap from the top of the pump.

  3. Using the funnel, begin pouring the coolant into the pump. The coolant will flow through the pump down into the radiator. You should see the radiator lines filling up with coolant.

    Pour coolant into the pump

  4. Fill the pump as full as possible with coolant.

  5. Hold the bowl or jug under the radiator bleed valve to catch any liquid that may escape. Unscrew the bleed valve to let any trapped air escape from the radiator. Liquid might come out of it if no air is present. Once the radiator is bled, screw the cap back on the valve.

    Bleed any trapped air from the radiator

  6. Top up the pump with more coolant.

Filling the Cooling System

  1. Connect the pump power to turn it on. The pump will begin pushing coolant into the rest of the system.

  2. Continuously fill the pump reservoir with coolant while the system fills up.

  3. Once the level stabilizes, fill up the reservoir to about an inch from the top.

Flush Out Any Remaining Bubbles

  1. With the pump cap still removed, let the system run for a few minutes or until no visible air bubbles remain.

  2. Screw in the cap on the top of the pump reservoir once completed.


AON-M2 Original Model Instructions

AON3D now uses a different coolant solution from the one originally shipped with the AON-M2. The new coolant is blue in colour. We advise you to switch coolants when performing the recommended maintenance coolant flush every six months. Perform a full coolant flush if switching types of coolant. Do not mix different types of coolant.

Required Tools & Equipment

  • A coin or large flathead screwdriver
  • A small flathead screwdriver
  • 3 bottles of coolant
  • A cloth (to catch excess coolant)

This procedure is best done with two people.

The cooling system takes 1.6L of coolant to fill. You may have additional coolant left after filling the cooling system. Keep this to top up the system over time.

Preparation

Please note the safety warnings from the supplier and use any necessary personal protective equipment (PPE) while handling the coolant.

The coolant bottles come with a spout assembly to help pour the coolant cleanly. Part of this assembly is a small tube packaged with the coolant.

Koolance bottle and tube

  1. To assemble the spout, first remove the cap and carefully pop out the center. Keep this center piece if you want to reseal the bottle later!

  2. Take out the rubber nozzle and place it upright on the bottle opening. Secure it in place with the cap.

  3. Take the clear tube and insert it into the nozzle. This is your completed setup for pouring the coolant.

Coolant nozzle assembly with tube

Before you begin filling the system, note the location of key components pictured below: pump cap, pump control dials, quick-connect tubes, and the pump power.

Original model AON-M2 cooling system pump with labels

Filling the Pump Reservoir and Radiator

  1. Turn off the pump power by separating the male and female connectors. The pump power connector is shown below.

    Original model AON-M2 pump power connector

  2. Ensure that you do not hear the pump running.

  3. Use the large flathead screwdriver or a coin to remove the black cap on the top of the pump reservoir.

    Remove the black cap

  4. Fill the pump as full as possible with coolant.

    Pour the coolant at a slow and steady pace to ensure that the coolant mixture does not spill.

Show pouring coolant

Filling the Cooling System

  1. Use the small flathead driver to set both pump control dials to speed 5. The pump control dials are numbered from 1 to 5. They are located on the rear face of the pump motors.

    Show pump control dials

    The pump may make a grinding sound. Completing the pump fill cycle will resolve this. The coolant pumps are not intended to be run dry. Avoid having the pumps run when the reservoir level is low. The pumps are most effective at driving air out of the system when the reservoir is near full before starting the pump so make sure to top up between each fill-pump cycle.

  2. Disconnect the left quick-connect by pressing on the green collar and gently pulling the grey connector. Have one person hold the cloth under the connection from the machine, ready to catch any coolant that may come out.

  3. Reconnect the pump power. The coolant level will drop.

  4. Have the second person fill the reservoir with coolant and keep it as full as possible.

  5. As soon as the coolant begins to come out of the left connection, reconnect the left quick-connect. Now the system should have full circulation.

  6. Continuously fill the pump reservoir with coolant while the system fills up.

Dislodging Trapped Air

If you have difficulty getting full circulation with the process above, one or both of the following methods should help. Otherwise, continue to the next section.

Method 1

  1. With the control dials set to speed 5, cycle the pump power on and off a few times. This dislodges any air clogging the circuit.
  2. Continuously fill the pump reservoir with coolant while the system fills up.

Method 2

  1. Disconnect the pump power.
  2. Disconnect the right quick-connect by pressing on the green collar and gently pulling the grey connector.
    Have a cloth handy to catch coolant coming from the tube.
  3. Connect the pump power. The coolant level will drop.
  4. Fill the reservoir with coolant and make sure the pump is as full as possible.
  5. Once the coolant starts to come out of the tube, reconnect the right quick-connect. Now the system should have full circulation.
  6. Continuously fill the pump reservoir with coolant while the system fills up.

Flush Out Remaining Bubbles

  1. Decrease the pump control dials to speed 1. The flow should become laminar and free of bubbles. Fill the pump reservoir all the way to the top.

  2. Leave the black cap off.

  3. Increase the right pump control dial to speed 2. Wait until the bubbles have mostly finished getting to the pump reservoir. Keep the reservoir full, adding coolant as necessary.

  4. Increase the left pump control dial to speed 2. Wait until the bubbles have mostly finished getting to the pump reservoir. Keep the reservoir full, adding coolant as necessary.

  5. Repeat the steps 3 and 4, buy with the pump control dials set to speed 3.

  6. Repeat the steps 3 and 4, buy with the pump control dials set to speed 4.

    Do not increase pump control dials to speed 5. This causes a turbulent flow which always traps bubbles in the flow back into the machine.

  7. Let the pump run for about 10-15 minutes. The bubbles will disappear as the coolant circulates. Keep the reservoir full, adding coolant as necessary.

  8. Attach the black cap on the pump reservoir with a large flathead screwdriver or a coin.

  9. Decrease the pump control dials to speed 1.

    The pumps must be set to speed 1 during normal operation to avoid trapping air bubbles in the flow. This enables the radiator to cool down the coolant which cools the printer components.

Pump control set to speed 1

Last modified: August 31, 2020