OK, I got my 4th sting of the season yesterday, but it was all my fault. I put my ungloved hand down right on a stinger and when I pulled up, got the hit.
I haven't been in the hives for 2 weeks or so and one definately needed more room--brace comb everywhere. Another hive had fully drawn, filled and capped one side of a frame but didn't build off the face of the foundation, but from the top. So, there was a hollow space on the back side between the foundation and the comb. I was able to scrape along the foundation and pull out a big piece of cut comb.
They have to rebuild that of course, but I got some early honey and they were otherwise too interested in cleaning up spilled honey to care about stinging me.