Default height was about 77 mm for me (may change for you). Can be scaled to preferred size.
I printed this with a height of 50 mm, measured diameter to be ~ 65 mm.
Recommend printing upside down to avoid need for support material at overhang on exterior. This allows the support material to be attached to the inside of the pot, preventing the center from collapsing. This allowed me to hide the rough surface left by the support material with potting soil.
Printer model is a lie. I actually used the 2012-2013 ply wood model.
Pot with my cactus planted inside
Used 123D Design
Drew sphere, drew cylinders and extruded to remove top and bottom.
Drew smaller sphere and repositioned it inside larger sphere, so both centers shared same point.
Subtracted smaller sphere from larger sphere.