This is a handlebar mounted basket for a small Razor scooter. The bracket attaches with two zip ties. The bracket has a recess for a captured nut and the knob accepts a bolt. There are four really small holes for attaching short lengths of 1.75 filament to prevent the basket from rotating, but the holes need to be reamed a bit to provide a tight fit
No real requirements, but I would use a skirt on the basket to keep it fixed to the bed during printing.
The author hasn't provided the model origin yet.