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What 5v 3 wire fans can be used for the Hemera?

The 24v 2 wire fan that comes with the Hemera does not work on a Prusa MK3S but you also don’t suggest using the Prusa stock fan in the instructions.

What fans would work for the Hemera and comply with the 3 wire 5v needs of the Prusa MK3S?

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2 Answers

Hi Doug,

We do not recommend any 3rd parts heatsink cooling fans at this point in time. We recommend wiring the stock Hemera fan to the power supply.

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Hi, I am currently testing what I think is an appropriate 5v fan for Hemera. It has a higher static pressure than the 24v Hemera fan spec and so far has worked very well at 5V. Expensive though at £24 approx.

spec below:


Packaging: -

Series: CFM-40

Part Status: Active

Voltage - Rated: 5VDC

Size / Dimension: Square - 40mm L x 40mm H

Width: 10.60mm

Air Flow: 10.0 CFM (0.280m³/min)

Static Pressure: 0.285 in H2O (71.0 Pa)

Bearing Type: Ball

Fan Type: Tubeaxial

Features: Speed Sensor (Tach)

Noise: 37.0 dB(A)

Power (Watts): 1.2W

RPM: 8300 RPM

Termination: 3 Wire Leads

Ingress Protection: -

Operating Temperature: 14 ~ 158°F (-10 ~ 70°C)

Approvals: CE CUR TUV UL

Weight: -


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Doug Robertson will be eternally grateful.
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