Summary You can use this brace on 80/20 1010 extrusions. They are the 1" by 1" extrusions. I am using this with my M3D 8020 mounts and filament holder found here: Mounts http://www.thingiverse.com/thing:867919 Spool holder http://www.thingiverse.com/thing:868784 These are a remix of Thing http://www.thingiverse.com/thing:98234 . Instructions There is a left and right mount for this. The longer edge will go on the extrusion that butts up against the other one. This way there is 2 bolts on each extrusion I printed this on the M3D printer using Cura to slice it. Here were my settings: 2.1 shell thickness .2 layer height 20% fill density with brim