I laid the connector Base_rear down flat for ease of printing but am seeing a small square artifact oriented diagonally just before it completes the portion with slots and moves on to the upper portion with holes. It covers up one hole and part of one slot. Is this a problem with Slic3r, my laying it down flat, or in the STL?

Looks like a slic3r bug. I did confirm the gcode has three layers of bridging on layers 8-9-10 that escape the perimeter. I downloaded the file and opened it in blender to view as wire frame (see attached picture), there is nothing in there that should cause the issue. Have you tried repairing it with nettfab? All of these files are re-exports to make sure that they were the most up do date files and may have never been checked or repaired.

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Yes, I was able to repair it with netfabb. I had to do it twice for some reason, but the artifact shrank to insignificance when done.

Yes I found a few of the STLs are not manifold but NetFabb fixed theml.

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