I'm designing a small enclosure for a headset matching adaptor. It's a small bracket that holds the 1/4" jack and the matching transformer, and an exterior cover slides over it.

The bracket features a shelf where the transformer attaches (flanges on the end of the transformer go into the little holes in the shelf and are bent over to hold it), and a hole in the end for a 1/4" jack.



When 3-D printing this, I've encountered a structural issue at the point where the shelf meets the main structure. I'd like to add a fillet to the area pointed out by the yellow arrow. Yet I can't get SW to understand what I want to do.

Any advice? I could make the shell go all the way the end, but that would complicate installation of the electronics.

Ron Wanttaja