3D printed model of the H I distribution and kinematics inside HCG 91 (at the 1.3 mJy/beam level). Cubes mark the position of the galaxies in the [X-Y-V] volume, and are colored according to Figure 3. The base plate contains a “sliding-rack” designed to hold an on-sky picture of the galaxy group, and augment the experience of the 3D print in allowing a direct comparison between the 2D projected diagram and the full 3D structure. Additional information (including the size and orientation of the VLA beam, visible as a black ellipse in the images) is also engraved in the base plate directly as part of the 3D printing process. The colors were added manually using acrylic paint, after dissolution of temporary support structures. For reference, the ruler at the bottom of the frames is in centimeters, and the model has a physical size of [15 cm × 15 cm × 19 cm].