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document updated 13 years ago, on Feb 1, 2011
Inkscape HOWTOs
doing the hex tiling
tutorial
doing the patterns (to make it easy to Ctrl+Shift+Y to signify similar tiles)
Patterns are yet not a well-polished feature in Inkscape. Therer are pitfalls (or outright bugs) relating to gaps showing.
mentions some of the caveats and/or fixes
official bug
proposed workarounds:
manually edit the .xml file, and adjust the bounding box
[1]
[2]