See attached STL files and decide which way you want to mount L-shaped alu profile and which element hast to be with chain link. If provided STL's are in wrong directions simply mirror them accordingly to your needs in your slicing software before printing.
Ideas roughly taken from http://www.thingiverse.com/thing:843399. Support for alu profile was too low for my MPCNC v525 and alu profile interfered with one of the central carriage elements. Maybe it was for older version of mpcnc.
I made brackets/supports taller, screw holes are not round but "slots" with possibility to set the alu profile at desired high.
Remember to come back and post what you've printed as Make.
It's good for the designer and the community (that means you)!
To post a Make, come back to this Thing and click Post a Make.
Or, you can use the Thingiverse Mobile app found on
and the Apple App Store.