I modified the Mark's threadless ball screw in order to attach the bed directly.
The slope angle is 38.5 deg.
The center distance is 9 mm.(this is same with my lm8uu holder)
The hole distance of flange is 31 mm.
Thickness was reduced to 12 mm.
I did not test yet.
I'd like to use this as X-axis and Y-axis on my printer.
I hope there's a good result.
August 5,2013 -- uploaded 20130802_threadless_38p5.stl
The hole dimensions for 623 bearings were reduced from 3.4 mm to 3.2 mm.
August 8,2013 -- Added Youtube movie http://youtu.be/TxOifzvnm70 (tested by hand)
September 9, 2013 -- uploaded Inventor original source file "20130802_threadless_38p5.ipt"
623zz bearing -- 3 EA
M3x10 mm bolt -- 6 EA
M3 washer -- 5 EA
M3 nut -- 6 EA