Supplementary Figure 1: Technical overview drawing of the Roadrunner goniometer.

The goniometer consists of three main components: an inline sample-viewing microscope, a high-precision scanning unit for fast scanning, and a motorized beam pipe unit. All components are mounted on a common support frame to achieve high mechanical stability. The overall dimensions of the support frame are 350 mm along the beam direction, the height is 515 mm, and the width is 400 mm. The beam and sample height is 250 mm above the base plate. The minimum possible distance between sample and detector surface is 50 mm allowing for the collection of high-resolution diffraction data. For better visibility, the open flow cryostat for measurements at cryogenic temperatures and the nozzle releasing a humidified gas stream for room-temperature measurements are not shown.