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Notdave - for some reason your comment is flagged for moderation and isn't showing but came through on email...anyway I've attached an updated STL which increases the wall thicknesses in the locations you highlighted. I've run it through several slicers and I'm not seeing any gaps. I did test it in Simplify3D and there were no gaps. Out of interest I was able to replicate your problem in Simplify3D with the previous model and then close the gaps by reducing the extrusion width to match my Makerware settings. Hopefully the new model works at your end too