I believe that TEMP2 is for a second extruder/hotend and that additional wiring is also for the second hotend temp sensor. That option isn't available for the UM2 and only experimental on the UM1 (which also has a TEMP2 and additional three wire connector).
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paddy 0
I meant I got the pics to work, not the printer! I took the cover off where the power enters and I found that the TEMP 2 socket has nothing plugged into it. I also noticed that there seems to be a wayward plug with a brown and red wire that isn't plugged into anythng. Should I get these two lovebirds together so they can make a baby in the form of working 3D printer? Or should I wait for someone who knows what they are talking about to give me adivice? I'll go for the latter. I have an image attached.
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