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Likely F3 fuse blown on the RAMBo board. It's a tiny nano (surface-mount type) fuse rated as a fast-blow 5A fuse. This protects the control and logic circuits. Mouser Electronics part # 576-0448005.MR Most posts report the cause of this being a short in the initial wiring of the fans, or, as in my ...

http://filaments.ca is out of the Toronto area. http://bootsindustries.com is out of Quebec. I've ordered ABS and PLA from Boots and have had great prints with the ABS. Not so much with the PLA but I'm a newbie, so I'll chalk that up to being lower down on the learning curve :-) I'm in Western ...