Wouldn't it be better to only cool the PTFE part? You want to keep your heat in the nozzle, just not in the PTFE cold part of your extruder.
What about a aluminium heatsink or water cooling jacket around a PTFE lining/fitting?
PTFE has fairly high heat resistance, so the impact of a heatsink would be subtle. Also, the temperature difference between the surface of the PTFE fitting and the chamber (right above the heated bed) is not very big.
How about something like this:
Sorry Kris for ruining your nice sketch... My idea is that everything below the green line would remain hot - while everything above it would be cooled as efficiently as possible. As the heatsink is likely to be warmer than the PTFE surface, it would probably make sense to leave the front and the rear of the heatsink open in order to let the 25mm fan to ventilate the PTFE efficiently. Also, because of the difference in surface temperatures, I wouldn't add a heat sink around the PTFE as the hot end isolator might actually radiate heat to it.
I'm planning to get my aluminum plate (the gray one in the picture) anodized, but not from its lower surface - otherwise it will just absorb heat more easily from the nozzle unit.
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3poro 9
The sketch seems to add heat conductive material between the heater element and the top of the hot end isolator. I would keep the conductive material to its minimum - as i is more or less in the original design. Instead, the added heat dissipation at the top is a good idea - maybe it could continue higher on the sides of the PTFE part? Not front or rear though, as it would likely prevent air flow around the PTFE.
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