Background
A follower asked: How to add ribs in the marked area (orange region)?
Cross-shaped intersecting ribs are very common, but sink marks often occur at the intersections.
Here are optimized solutions:
Remove one outer rib to turn the cross shape into a T-junction, which reduces sink marks.
The asterisk/star-shaped rib has similar drawbacks:
The T-shaped reinforcing rib is simpler and was shared by a group member.
For radial ribs on a circular plate:
You can add a circular groove in the middle.
This also prevents sink marks and extends mold life.
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