This is a script for a partial ring with rounded edges [ partial ring with rounded edge.lsf (1.7 KB) ] .
By setting the start_angle = 0 and stop_angle = 360, you can also create a ring with rounded edge.
More complex structures such as a pinwheel can be created based on multiple partial rings [ pinwheel with rounded edges.fsp (1.4 MB) ].
The above structures were created using the planarsolid primitive. For further information about planarsolid, please have a look at the following links: