Power down your printer, unplug USB and ensure no power is being supplied to your printer.
Remove the RamboMini cover and double check the wiring diagram to ensure the print fan is
You can easily test the print fan function from the LCD menu Settings - Temperature - Fan speed. Always test with at-least 50% power, when you select the speed confirm by pressing the selector.
If the fan doesn't spin up, you can unplug it from the electronics board and test it with the 12V DC power source. If the fan spin up with external power source, check all the fuses in RAMBo board.
Print fan is never used during the first layer of any material. From second layer up, it depends on the material profile selected in the slicing software. For example with PLA, print fan is running at 100% all the time until the print finishes. For ABS, the fan is turned off by default in our print settings.
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