Solid, not hollow. Each stand is one profile extruded across its width, so it prints lying on its side with no supports and no weak overhangs — the phone and tablet cradles as one piece, the laptop stand as two matching risers you set under the back corners. The lip groove takes a phone or tablet with its case on; the slot in the lip passes a charging cable. The label is a 0.6 mm inlay in the lip's face.