I have a ToM with MK7 and recently upgraded to the latest Replicator-G, Makerbot firmware 3.1, skeinforge 50, etc. Everything seemed to be fine with the test prints.
However then I tried printing a fairly tall piece (60mm) that tapers to a thin edge, so the Cool plugin kicks in (it's set to 5 seconds) and activates Slow Down.
Now the Slow Down activates as it should, but it seems to be laying down too much plastic. It pushes out so much plastic that eventually the nozzle is swimming, and the print is simply a write-off. I moved the Minimum to 10 seconds and the extra-plastic started lower than the tapered edge. Back to 5 seconds and the extra-plastic is higher up.
I've tried Skeinforge 47 with no difference. Then tried the Jetty 3.4 firmware with no difference. Thought it might be the z-hold bug but the off/on trick and a reset didn't make a difference.
Is there a known bug in Cool and Slow Down where the extruder's flow rate keeps going at full speed? That's what it looks like to me, even though I know that sounds silly.