Any substitutes for the 30mm fans on UM2 ?

[Marty70 0]

I tried to replace mine (a lot of noise and vibration) and failed miserably, the fans never turned. I ordered these from digi-key , sunon MC30101VX-E01U-A99 those are 12vd. Since standard fans have 2 wire my guess is they are not pwm capable fans, though they are driven by pwm from the board.

I wonder if its cause from unsmoothed dc from mainboard ? , or those standard fans are special?

[pm_dude 27]

Hi Marty,

I did change my fans for 40mm ones used on RepRap printers. Both need to be exactly the same make and model and need to support pwm.

The fact that the board is controlling it doesn't make it less needed to be supported by the fans as it changes the way current is used. (50% speed is not a constant 6V but 12V half of the time).

I did have to try a few different makes to find a working pair and unfortunately cannot tell you what they are (they were in a mixed box and dont have clear labels).

The good news is that you can order them online at fbrc8 if your in North America http://fbrc8.com/collections/ultimaker-2-spare-parts/products/model-cooling-fan-12vdc-0-1-a-x2

[Marty70 0]

Thanks i will buy new one from the fbrc, but still wonder why it didnt worked.

[pm_dude 27]

It need to support pwm controlled.

[Marty70 0]

I thought all pwm fans had 4 wires, i was wrong. Then these from digi-key should work

OD3010-12HB5-ND. I guess some dc filtering is include in the fan driver circuit.

[pm_dude 27]

It might although it specify 3 wires (unlike what the picture shows)

[Marty70 0]

the third one is for the tachometer, not necessary here but it doesnt need to be connected to work.

[pm_dude 27]

Ha nice. Good to know