<p>I'm looking to 3D print a structure that won't deform in high heat, up to about 220&nbsp;&deg;C. The filament itself can be 3D printed all the way up to about 380&nbsp;&deg;C. </p>

<p>PEI seems like it could be a viable option. I found some <a href="https://www.matterhackers.com/store/l/3dxtech-thermax-pei-175mm-05kg/sk/MHCFSNUC?rcode=GAT9HR&amp;gclid=CjwKCAjwqZPrBRBnEiwAmNJsNsqaaSEcWYtaTv1rIwDKuWgI9xCyinqDgV7bYUUO3zX7-pIA0gDPSBoCclYQAvD_BwE" rel="nofollow noreferrer">here</a>. This PEI filament  specifies the glass transition temperature at 217&nbsp;&deg;C.</p>

<p>Would this filament work? Are there any other types of materials that would fulfill this engineering requirement?</p>

[{'answer_id': 10876, 'author': '0scar', 'author_id': 5740, 'author_profile': 'https://3dprinting.stackexchange.com/users/5740', 'pm_score': 3, 'selected': True, 'text': '<p>Your expected operating temperature exceeds the glass transition temperature by 3&nbsp;&deg;C. This implies that the structure will become weak and can deform under load. </p>\n\n<p>Note that you cannot simply print PEI on a normal machine, it requires a special high temperature capable printer with hot end temperatures up to 400&nbsp;&deg;C and heated bed over 120&nbsp;&deg;C up to 160&nbsp;&deg;C, furthermore it will need a heated chamber (up to about 80&nbsp;&deg;C) which requires special care to cooling and placement of electronics and motors.</p>\n\n<p>Not having specified what kind of structure you require, you could look into steel.</p>\n'}, {'answer_id': 10877, 'author': 'Davo', 'author_id': 4922, 'author_profile': 'https://3dprinting.stackexchange.com/users/4922', 'pm_score': 2, 'selected': False, 'text': '<p><strong><a href="https://en.wikipedia.org/wiki/Polyether_ether_ketone" rel="nofollow noreferrer">PEEK</a></strong> is also used in applications where dimensional stability (and/or chemical resistance) over a wide range of temperatures is desired. The requirements for printing are similar to those for PEI.</p>\n'}, {'answer_id': 10961, 'author': 'Tegra', 'author_id': 17478, 'author_profile': 'https://3dprinting.stackexchange.com/users/17478', 'pm_score': 1, 'selected': False, 'text': '<p>An easier but less simple solution might be to make a PLA \'pattern\' that is the right size and shape, then use that to cast your item in aluminium  (melting point ~ 660C) using the \'investment\' or \'lost PLA\' process.<br>\nLinks:- \n<a href="https://www.instructables.com/id/3D-Printed-Lost-PLA-Investment-Casting-Aluminium/" rel="nofollow noreferrer">https://www.instructables.com/id/3D-Printed-Lost-PLA-Investment-Casting-Aluminium/</a>\n<div class="youtube-embed"><div>\r\n                <iframe width="640px" height="395px" src="https://www.youtube.com/embed/qxj5eUkAFUI?start=0"></iframe>\r\n            </div></div></p>\n'}]
['https://3dprinting.stackexchange.com/questions/10875', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/10369/']