Step 7 of the workflow (Fig. ) presents sample sets to an X-ray diffractometer. The way in which the 3D printed sample holder shown in main text Fig 2d holds the samples parallel to the table of the X-Ray Diffractometer is illustrated in the schematic below. The glass plate (6mm soda lime glass) was added to eliminate small peaks due to the stainless steel XY table which were observed in some early experiments.