At startup, Simplify3D will ignore the cooldown settings. Simplify 3D turns on both extruders at full power. It should only turn on the active extruder at full power, and cooldown the other extruder.
You will see this at the start in the G-Code (cooldown is set to 170 C in my test, but we see 220 C here):
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M104 S220 T0
M104 S220 T1You will see this at the start in the G-Code:
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M109 S220 T0
M109 S220 T1You will see this after the specified layer starts in the G-Code (in my test this was layer 2):
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M104 S220 T0
M104 S220 T1These bugs cause oozing, and make Cooldown extruder while idle pretty useless. I spent a day battling this trying to get things to work properly and gave up on using Cooldown extruder while idle. It would be great to use it. It's a useful feature. But these bugs ruin it.
I was able to get around these issues by using other tricks to force the active extruder to be on at full blast and the inactive one to be set low. I got it working, but it's hacky. See here: viewtopic.php?p=74449