add new print-friendly folder, and update rbuild accordingly. also refactor+fix xBar

rack/assembly/fullAssembly.scad

@@ -4,43 +4,4 @@ include <./mainRail.scad>
 include <./yBar.scad>
 include <./xBar.scad>
 
-translate(v=[12,2,18])
-mainRail();
-
-translate(v=[12,2 + 200,18])
-mirror(v=[0,1,0])
-*mainRail();
-
-translate(v=[12 + 216,2,18])
-mirror(v=[1,0,0])
-*mainRail();
-
-translate(v=[12 + 216,2 + 200,18])
-rotate(a=[0,0,180])
-*mainRail();
-
-*xyPlane();
-
-translate(v=[0,0,250])
-mirror(v=[0,0,1])
-*xyPlane();
-
-module xyPlane() {
-  yBar();
-
-  translate(v = [240, 0, 0])
-  mirror(v = [1, 0, 0])
-  yBar();
-
-  translate(v = [30, 0, 0])
-  xBar();
-
-  translate(v = [30, 206, 0])
-  mirror(v = [0, 1, 0])
-  xBar();
-}
-
-yBar();
-
-translate(v = [30, 0, 0])
-xBar();
+// TODO