I'm doing something like 75% extrusion 60% speed. The tube is 1/8" aluminum tubing with a lot of tiny holes angled inward so there's gentle cooling just outside the nozzle. It's fed by an aquarium pump. I think the cooling could be a little bit stronger but when I slow it down like this it works OK. You just don't want turbulence blowing neighboring strands onto your fresh extrusion.
The water system seems to do a good job of keeping the cold end cold in a heated build environment. Black is the coldest on the scale, showing the block and water lines as the colder than the surroundings, as I had hoped it would be.
I have one of the AliRubber silicone heated beds. I know the thermistor beta spec is 3950 and its resistance is supposed to be 100k at 25C. I set up the appropriate value in smoothieware config file and I'm getting readings of 130C at room temperature. The second thermistor also reads the same. Does anyone here have any idea what to try next?
The thermistors do respond with added heat (hand touching sensor area).