<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>

[{'answer_id': 10172, 'author': 'dagoth', 'author_id': 8826, 'author_profile': 'https://3dprinting.stackexchange.com/users/8826', 'pm_score': -1, 'selected': False, 'text': '<p>3D printing nerd showed a couple of filaments that fits this in his latest video "Printers at RAPID + TCT 2019":</p>\n\n<p><div class="youtube-embed"><div>\r\n                <iframe width="640px" height="395px" src="https://www.youtube.com/embed/obCgJQp5Yj8?start=0"></iframe>\r\n            </div></div></p>\n\n<p>Firstly a <a href="https://www.youtube.com/watch?v=obCgJQp5Yj8&amp;t=35" rel="nofollow noreferrer">Nylon 6 high temperature filament</a>:</p>\n\n<p><a href="https://i.stack.imgur.com/x7lo5.jpg" rel="nofollow noreferrer" title="Flexible 3D printed part - printed from high temperature nylon"><img src="https://i.stack.imgur.com/x7lo5.jpg" alt="Flexible 3D printed part - printed from high temperature nylon" title="Flexible 3D printed part - printed from high temperature nylon"></a> </p>\n\n<p>Another part of the video shows another flexible print, created on a four axis 3D printer, using <a href="https://www.youtube.com/watch?v=obCgJQp5Yj8&amp;t=987" rel="nofollow noreferrer">TPU filament</a>:</p>\n\n<p><a href="https://i.stack.imgur.com/Wrgxm.png" rel="nofollow noreferrer" title="Flexible 3D printed part - printed from TPU"><img src="https://i.stack.imgur.com/Wrgxm.png" alt="Flexible 3D printed part - printed from TPU" title="Flexible 3D printed part - printed from TPU"></a></p>\n'}, {'answer_id': 16402, 'author': 'Rob Lent', 'author_id': 28638, 'author_profile': 'https://3dprinting.stackexchange.com/users/28638', 'pm_score': 1, 'selected': False, 'text': "<p>Ok, so to answer the primary question: What flexible filament will operate consistently at 250\xa0°C?</p>\n<p>Man, this is a tough one. Some filaments, like PEEK and ULTEM 1010 can operate up in the 200\xa0°C range, but they're not flexible at all.</p>\n<p>Silicon might be able to work, but you're still pushing boundaries.</p>\n<p>Now, I'm lucky to be in a 3D printing company and we're testing a super-high-temp flexible material, very similar in temperatures to ULTEM. I'll definitely check back and let you know how it goes, but...</p>\n<p>Honestly, that's so hot! Readily available thermoplastics may not be an option unless you're in aerospace with an unlimited budget which, based on the requirements, would make sense, lol!</p>\n<p>I'd say the most readily available way to get this done would be 3D printing a mold, in which to put your silicone, and bam -- you've got the part.</p>\n"}]
['https://3dprinting.stackexchange.com/questions/10167', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/16467/']