Prints without supports but make sure to turn down the speed on overhangs - the two largest pieces have challenging overhangs.
Use CA glue to assemble. Some sanding may be needed where the lower 2 pieces fit together, especially if your first layer was too low/smashed or otherwise had elephant foot.
Since people keep asking, the shelf pictured is:
https://www.printables.com/model/90656-honeycomb-display-shelf-no-supports-required
The author marked this model as their own original creation.