This can be printed in PLA without supports if your printer is setup well and is capable of bridging. If you examine the photograph closely you will note that the horizontal bar at the top has is not perfectly horizontal but bows slightly. If you use supports then your print will not bow. I printed the example in the photograph using Simplify-3D. 0.6mm nozzle, 0.3 mm layer height in PLA on an Ultimaker 2+.