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It's the temp sensor cable - not the heater cable. Disconnect this cable from the board underneath and measure the resistance. It should be a steady 108 ohms or so (depending on temperature). 300 degrees is over 200 ohms I think so if the resistance is fluctuating between 100 ohms and 200 ohms that is the problem. Try jiggling the wire where it meets the heated bed. it could be the wire isn't screwed into the bed properly.
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We don't often release an alpha version of Ultimaker Cura... So what's different this time? This Alpha contains such a huge slicing engine overhaul that we really need your help!
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It's the temp sensor cable - not the heater cable. Disconnect this cable from the board underneath and measure the resistance. It should be a steady 108 ohms or so (depending on temperature). 300 degrees is over 200 ohms I think so if the resistance is fluctuating between 100 ohms and 200 ohms that is the problem. Try jiggling the wire where it meets the heated bed. it could be the wire isn't screwed into the bed properly.
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