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AON-M2 Machine Setup

Filling the Cooling Circuit

You will need...

  • Deionized Water, 2L
  • A coin or large flathead driver
  • Wirecutters
  • Jug, pitcher, bottle, or otherwise similar container for water/coolant

Deionized (DI) water is required to fill the cooling circuit and can easily be found at your local grocery or hardware store.

AON3D recommends premixing the DI water and the entire bottle of coolant concentrate in a separate vessel (ideally a pitcher with a narrow lip for easy pouring)


Do not use regular tap water or any other coolant mixture not authorized by AON3D. With improper cooling fluid, potential failure mechanisms include: galvanic corrosion, algal growth, scale formation, and polymeric degradation - all of which will cripple performance of the cooling system and can lead to catastrophic component failure.

On the rear face of the pump motors is a red dial with an arrow and the numbers 1 through 5. Set both pumps to the "3" setting.

Start by opening the fill port of the pump reservoir with a coin or large flathead driver. With the aid of the included funnel, pour coolant into the circuit until the reservoir is almost filled to the top.

Pump Fill

Plug the pump motor power into the harness that was installed earlier, and let the pump run until the reservoir level goes down. Unplug the pump power to stop it. The funnel should be removed from the fill port when the pump is running to let air escape from the system easily.


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, so make sure to top up between each fill-pump cycle. If you find the pump is still unable to fill the circuit, cycling the pump power on and off a few times is effective at dislodging any air clogging the circuit.

After about 3 cycles, there should be enough coolant in the circuit to achieve "steady state" flow. At this point you no longer need to cycle the pump on and off - simply keep refilling the reservoir as necessary as air continues to flush out of the circuit. Increase the pump motor speed dial to "5".

Let the circuit run for 10 minutes, top off the reservoir levels one last time, and then replace the fill port cap.

Air will continue to bleed from the system, so after the first 10 and 50 hours of operation, remove the fill port cap and top up the reservoir with pure DI water.


Checking the reservoir levels about once a month is recommended, as the coolant evaporates over time.

last updated: 31/07/18