I've printed this on a Prusa MINI+ with a 0.8mm nozzle, 0.4mm layer height, in Hatchbox PLA. Should be fine without supports or infill. Recommended to put some kind of non-slip padding on the bottom for improved functionality.
Several optimizations can be made (.stp included) – height can be decreased to use less vertical space, horizontal angle can be increased to use less horizontal space. Bracing can be redesigned to be stronger / prettier.
The author hasn't provided the model origin yet.