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Temperature drop on certain prints

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I have a UM2+ running Tinkergnome. I use Cura 15.04 to generate the gcode. I drag the gcode to OctoPrint and it prints.

Some things I print, start fine, but the temperature drops and then nothing comes out after that. But others print out without issue. The process for everything is the same.

What in my process would alter the temp like that? Is there something I can look for in the gcode?

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Currently, it is set to 3 minutes.

Why would that setting only affect larger prints and not smaller ones?

 

My suspicion is that this happens, if the command buffer runs empty. And the probability for this is much higher on longer prints with many (and small) line segments.

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