English manuals for Original Prusa i3 3D printers

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Extruder fan, supply voltage?

The fan that came in my recently ordered kit is not functioning I made it about 20 minutes into the test print and then the i3 stopped extruding and the gear was turning but the filament wasn't being extruded. I was able to reverse the direction of the extruder in Prontface and then reload the filament then the nozzle would start extruding again but only for about 30-45 seconds. After searching online I saw it might be my extruder nozzle overheating and I noticed the fan was not working. I then made sure the polarity was right on the fan and it was. I removed the fan from the RamBo board and tested it with 3 and 5 volts and it was not working I didn't want to test 12 volts until I knew how many volts the fan is. If you could send me the voltage information for the 25x25x10mm extruder fan so I can order a replacement, I am comfortable soldering new connectors. Also if you know the voltage that should be coming out of the board so I can check it with my multimeter.

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I have the same problem with the extruder fan not working in my new assembly kit. I verified the problem to be the fan and not the Rambo board by switching the extruder fan connection with the print fan connection and running self test. In my case the print fan ran when the test asked if the extruder fan was running but the extruder fan did not run when power was applied to the print fan connection. I was glad the problem was not with the Rambo board. Prusa is sending a replacement extruder fan.


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I had same problem. Extruder fan wouldn't turn on, thus ruining the print a few seconds/minutes after starting ok.

I connected the fan to 12V and it is now always on, an the printing going on fine now.

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My fan didn't work but I tested it at 5V supplying it separately and it works fine. I conclude that the fan is not the problem. Pablo10's suggestion look like a reasonable step if no one has a better idea.

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My fan didn't work on the RAMBO board, but did work on a 12 volt power supply.

the fan connector pins were in the wrong holes, so the fan was not getting the right power.

I used a needle to release the connector and reversed the connections, all is now well!


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Ryan Moody will be eternally grateful.
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