A Lulzbot Taz was repurposed as a PEEK and PEI high temperature desktop 3D printer. NASA and Michael McHugh did research in turning a LulzBot Taz and an Ultimaker 2 into a high temperature PEEK printer. The high abrasion resistance, high chemical resistance, low chemical resistance and high strength character of these materials make them the highest performance 3D printing polymers in the market. These materials are especially coveted in research in particular for aviation companies also using these materials on board air craft.”]
Source: https://www.3d4makers.com/blogs/news/turning-a-desktop-3d-printer-into-a-high-temperature-printer