As far as the design of that nut trap, the space is very limited with that threaded rod so close to the X-axis aluminum extrusions. There are at least a couple of ways to make that nut trap thicker, now that I look at it again. I could get rid of the connection along the side & have the nut trap above the alum. or I might could drop the nut trap below the bottom of the upper X-axis alum. extrusion. I would only have 1 support connection to the alum. if I put the nut trap above. My original thoughts on the remix of scratchhax's design were 5 of the 6 sides of that nut were thick enough to hold it in place.

I will have to revisit that design to see if either of those options are better. BTW, I have been using those nut traps for a couple of weeks now without any problems.

Thanks for the critique on the design.