I wasn't comfy with the drill/tap concept on printed parts for the original (and most excellent) Aluminum Mendel design. So I went ahead and started making some trapped nut versions of the affected parts. Hopefully, I'll find time to work out more trapped nut replacement derivatives soon... until then, here's the set of brackets that hold the Y axis smooth rods in place.
I've included STL files for both 8mm and 10mm smooth rods. Setscrew/nut sizes in those STLs are #6/32 SAE.
These models are scaled around my printer's nuances, so salt the .scad source to your own taste.
The .scad file has source for both the regular and offset versions of the part. Just change the boolean at the top of the file for desired output. (and the other stuff too, if you've got #4/40 or metric and all that)