herringbone rack and pinion?

Is anyone working on the development of a printer that uses printed herringbone rack and pinion for X and Y movement instead of belts?

If this has been ruled out for some reason I'd be interested in hearing why.

I would also be interested in 'herring' if anyone has used this method

Forrest did some work on it - Rack - herring - Forrest

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[richrap.blogspot.com]

Why Herringbone? Why not spur rack or helical rack? Herringbone is expensive when there is rack and pinion available off the shelf. There is some resolution issues if +/-.002" is not close enough.

There are many people making CNC tables and that ilk with rack and pinion, but that is usually for a large area such as 4'x6' or 8' x 12'. Aren't these printers typically pretty small?

www.mooregear.com

expensive? If you print them they cost the same as spur/helical. herringbone has less backlash than spur.