This is a magnetic parts dish, for holding nuts and bolts, or anything that sticks to a magnet. You'll need 5 magnets, 3mm by 6mm. I have also designed a magnet installation tool that doubles as a short magnetic pickup tool. Both print without supports, with basic settings on my Mini. Print the dish right side up, and the tool with the ball at the very top.
The author hasn't provided the model origin yet.