Stand to mount on shaft solar-powered turntable. I got a cheap turntable for a UV curing station for resin prints and for video of small parts. It came with a clear acrylic table, which looked really untidy. Printing this one in black for a neutral place for small parts for UV curing and for beauty shots.
Rotator shaft on turntable is about 3.8mm square. The hole is sized to be a snug but easy fit. Scale to fit a different shaft -- the rest of the dimensions aren't particularly important.