Mostly Printed CNC Roland Drag Knife Holder

After having given Allted's Liyu/Roland Drag Knife holder design a try:
http://www.thingiverse.com/thing:780877

I found it was limited because the drag knife could not float over the surface. If you use a cutting mat under your material like I was, you'll find they are not *perfectly* flat. When material thickness is measured in thousandths of an inch, this means the cutter will constantly be lifting and crashing across the material, resulting in incomplete cuts and material snags. I fou