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We present a novel method of 3D printing with the fluoroplastic Kel-F (PCTFE)that was used to create target material cups for dynamic nuclear polarization(DNP) experiments. Kel-F is used in DNP targets because it has severalproperties that make it well-suited to this purpose: transparency tomillimeter-waves, plasticity at cryogenic temperatures, and the absence ofhydrogen that would add an unwanted background to NMR signals used to measureproton polarization. A custom filament production device called the Filatizerwas developed that processes commercially available rods of Kel-F into a1.75-mm diameter filament that was 3D printed using a Prusa i3 Mk2.5S modifiedto achieve the high temperatures (~ 400 C) needed to melt the material and withcopper-based components replaced to reduce material decomposition. Thisprinting process does not significantly alter Kel-F's properties, and wedemonstrate the first 3D-printed Kel-F target cups successfully used in DNPenhancement.

Fabrication of 3D-printed PCTFE material cups for dynamic nuclear polarization target at cryogenic temperatures