So I was gifted a Robo 1 which I am now having some issues with. About a week ago I was trying to print and for some reason the warming bed kept trying to heat to 90 degrees when I had it set for 55. I kept fighting to get it to change, but to no avail. I should mention I was using MatterControl and the USB cable rather than the SD Card. After several cancels, a few power offs to cool down, it finally puffed smoke from the underneath and then wouldn't warm or read the bed at all. My daughter and son-in-law came over to help me and we thought that the ramps board had fried, so we ordered a new one and replaced it with no luck. We eventually thought that the cable to the bed may be bad, or have a short in it and gave up for the evening. A couple days later I thought I would try to test the wires to see if I could find a short. I did find a bare section that looked like it had overheated and melted through. So I replaced the end. (It was the connection for the, I believe, the sensor, since it was thinner and connected to the ramps board. So, I don't think it was the power cable). I replaced the cable tried to print, and, sure enough, it started warm and read on the display....... until there was another puff of smoke. I then tried a combination of new and old ramps boards, arduinos, and an (seemingly) infinite combination of mixes and matches trying to see if I could narrow down if it was one of the boards. After two hours of this with no luck, I happened to notice that same wire that I had just replaced had, again, melted through and shorted. I am guessing that the puff of smoke in both instances was, in fact, the wire going to the bed and not the ramp or arduino at all. I have just ordered a new bed from Robo, because it is about the only thing (besides the power supply) that hasn't been replaced. My question(s) to all of you is if any of you have experienced this problem? And, do you think I'm going down the right track? Any, thoughts, suggestions, or any other input would be very helpful. Oh, and I should also mention that I am 112% a NOOB. So, please, if you post a reply, please be kind and type slowly and clearly so that I can understand you. Thanks for your help. Troy Edit: I thought I would try to remove the cable completely and try to print on a cold bed (because I'm just that much a fan of self-inflicted pain). Now I get no reading from the extruder in degrees, and the display reads Err: MAXTEMP BED (and the cable isn't even connected) Just more info for your confusion.