3D printed sample tubes for solid-state NMR experiments.

The availability of 3D printers and an assortment of polymers that can be fashioned into a wide variety of shapes provides opportunities to rethink the design and construction of probes for NMR spectroscopy. The direct interfacing of computer aided design (CAD) with precise 3D printing enables the simplification and optimization of probes through the rapid production of components. Here we demonstrate the use of 3D printing to fully integrate a permanent former for the radiofrequency (RF) coil with the sample chamber (equivalent to the sample tube). This simultaneously increases the sample volume and improves the filling factor within a fixed outer diameter (OD). It also reduces the space lost in dual coil arrangements where a high frequency resonator is positioned outside a solenoid coil tuned to one or more lower frequencies, making multiple-resonance experiments more efficient. The initial applications demonstrate the possibilities for future designs that reimagine the interface between resonators and the liquid, solid, and heterogeneous samples encountered in NMR studies of biomolecules, polymers, surfaces, and spectroscopy (MRS) and imaging (MRI) of biological organs and intact organisms.