My first blowout :( Help diagnosing the cause please?

[Wolfie]

I was printing a tray out of black PLA. It has a lower section and a handle. The attached image are the supports that it was building to make the handle, obviously the handle didn't happen either. All supports and piece parts all disintegrated at about the same altitude off the build plate. Any thoughts on why or what I did wrong?


0.3mm layers
5 Solid top and bottom
4 Perimeter
.35mm nozzle on a hex hot end (Taz5)
Extrusion width .42mm
Support with 25% infill and inflation of .5mm
Extrusion at 215c
Bed 60c
Cooling at layer 5+ 100%