Low cost 0 backlash transmission - Ball bearing + trapezoidal screw

[Jonathan]

Where did you find this thing on the picture, enclosing the ball bearing?
Did you get it machined?

I cnc milled it on my machine. I can send you the drawing/Gcode/make another if you like. I made it that slightly odd shape to fit in a tight space on the Z-axis before changing the router design somewhat and using it on Y. If I did another for the Y I would leave more material there for the bolts, and put a spring/belville washers on the bolts so that it rides over imperfection in the screw,

[LabSkis]

OK. Thanx for your proposal.
But I have nothing around here to get this thing machined.
For the moment, I think I will stick to 0 backlash nuts like the one you find on dumpster cnc.
Yet, do you think it has a real advantages on those nuts in terms of backlash or friction? Despite the Acme being worn by the roller bearing?