<p>I need to cool some liquid (250&nbsp;°C) while it’s flowing through a tube which has to be able to bend and flex.
My idea is to make a flexible tube with a second tube spiraling around it through which coolant will flow.</p>

<p>I’d like to 3D print this tube if possible so I wonder if there is some printable filament that:</p>

<ul>
<li>doesn’t melt at 250&nbsp;°C</li>
<li>is flexible enough that it can print some tube that can bend (bending radius of 30&nbsp;cm)</li>
<li>optimally also has good heat conductivity</li>
</ul>

<p>Is there any 3D printer filament available that has these properties?</p>

3D printing nerd showed a couple of filaments that fits this in his latest video "Printers at RAPID + TCT 2019":
Firstly a
Nylon 6 high temperature filament
:
Another part of the video shows another flexible print, created on a four axis 3D printer, using
TPU filament
: