This is a challenging print. For best results use organic supports, making sure that the Branch Angle is set to a high enough value that the overhangs get fully supported all the way around . A branch angle of 60 degrees seems to work well.
Update 2024-03-22: I've added a new “Tall Base” version of the model that raises the height of the base and adds a large chamfer to the bottom edge of the base, enabling the planter to be printed at a 45 degree angle. Doing so is a bit tricky and it is advised to paint on supports as shown in the images. The benefit of doing so is that there is a very minimal amount of top and bottom surface when printed at this angle. The top and bottom surfaces of the planter come out very smooth because they're perimeters. It also uses less support material.
I've included a .3mf that I used to successfully print the planter shown in the photos. Aside from the support painting, it also adds denser infill to the base using a modifier block. A brim is advisable as I had some warping.
The author remixed this model.
Used the original cable chain design as the basis for a planter.