update slacks and ybar-plate connector

stl/rack/print/mainRail_P.stl

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@@ -23491,6 +23491,20 @@ solid OpenSCAD_Model
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@@ -27299,6 +27299,20 @@ solid OpenSCAD_Model
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stl/rack/print/stackConnectorBottom_P.stl

@@ -2309,6 +2309,34 @@ solid OpenSCAD_Model
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