I couldn't resist trying out vase mode. I used a very slow speed to start with, then kept cranking it up by turning the knob on the machine. It continued to work great up to 500% (40mm/sec * 5 = 200mm/sec) !!! Because the print head is so light, and the printer so rigid, it handles this with almost no perceptible drop in quality. However, around 600% it started having issues keeping up the plastic flow, and the layers stopped sticking so well. The lesson here is that I've been waiting too long for my prints!