Designed up this planter to make room for my avocado tree seed that was sprouting.
Dimensions:
100mm [4"] Dia at top & bottom
Ribs extend to 144mm [5 5/8"] Dia at the widest point
100mm [4"] in height

Printing:

Supports are needed for the main pot, the ribs extend below the surface and fits snuggly over the base.
Supports are optional for the base.