ok, so i loaded it back up into Blender to take a closer look at this thing... it is made up of small segments that are not really joined all that well...
looking at it in wireframe mode from the top looking at the bottom...
it also seems there may be a few faces oriented the wrong way...
did a recalculation of the normals and exported it...
try this...see if it behaves any differently.
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SD4 #1 & #2 - Lawsy carriages, E3D v6, Rumba controller board, mirror bed plate, X motor fan, upgraded PSU & Mica bed heater
SD4 #3 - in the works ~ Folgertech FT-5, rev 1
Printit Industries Beta Tester - Horizon H1