My Robo3D has been customized hot end with ESD V6,
So original part was not matched on height requirement.
I had customized STL file for lowering as 8mm down for this case.
Fixed for void area

I have created 4 snapshots of SVG via 123Design,
And modified it on InkScape for this requirement.
Extrude each layer on 123Design and merged together in sequence.
My poor Inkscape operation surface are not smooth and some gaps are shown.
You can modify it on 123Design for cut off.