Plotting an AutoCAD drawing with hatch transparency to PDF causes a boundary to appear around the hatch. When this is printed, this boundary results to a black solid box/boundary. This behavior has been reported when printing PDFs to physical (paper) printers using: the Apple Preview app Microsoft
Plotting transparent hatch objects in Xrefs makes Civil 3D to crash or freeze
AutoCAD System Variables
Solved: Transparent solid color hatch to pdf with lines - Autodesk Community - AutoCAD LT
Additional lines appearing on HATCHes when plotting from PDF - AutoCAD Drawing Management & Output - AutoCAD Forums
Printer doesn't print hatch in transparency - Autodesk Community - AutoCAD
Printing in BricsCAD – Layouts
Topic: Why are There Lines Showing in My Solid Fills?
Poor Quality Solid Hatch with transparency - Autodesk Community - AutoCAD Map 3D
Solved: Problem: PDF print generates strange lines over hatch objects (ACAD 2012 LT) - Autodesk Community - AutoCAD LT
Technology Preview) Using PDF Files
Solved: Parts of Hatch Printing Black - Autodesk Community - AutoCAD
Print Dialog
Workaround For Printing Solid Hatches With Transparency In AutoCAD For Mac
AutoCAD Tutorial Handout, PDF, Cartesian Coordinate System
Solid hatches wont print all of a sudden - Autodesk Community - AutoCAD