Anybody can build an inexpensive model of a black hole of Earth Mass for about $10. Fun conversation piece. Here are all the details. Only slightly dangerous. Only bites a little. Hangs on a wall.
It seems there are two different definitions of a black hole .. one the event horizon which is just a distance radius and doesn't spin, and one is the object itself, the distribution of mass 'in' the object, which exists both outside and inside the event horizon which does spin. This model kinda captures both meanings.