Retraction Dual Tower Test

I liked Stephen Albert's retraction test, but wanted something smaller that printed quicker (6-9 minutes rather than 15+). With rounded corners and only a thin strip of plastic connecting the two towers, it reduced the amount of plastic without reducing the stability of the part. And, I found that any of the printing artifacts (stringing, blobs, or "residue spikes" were evident within the first 1cm, so no real need to make it taller than that.

The base are 5mm radius 1mm tall cylinders and