Merged gridfinity adapter plate + scaled to size of the plate in X and Y. 30 solid bottom layers at .2 height, vase mode for the rest in superslicer (not sure if PrusaSlicer can do this as of 2.5 yet).
Setting Vase mode in Prusa Slicer with 30-32 bottom layers @ 0.2 layer height appears to also provide the correct behavior.
Base ends at 29 layers, 30's layer is also “solid” so you don't get a line across the base where it is doing spiral vase mode from the edge of the base inward.
Licensed under the base license as it is slightly more restrictive.
The author remixed this model.