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 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!

Joan

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Ryan Moody will be eternally grateful.