Fix rail mounts

lib/bearing_idler.scad

         }
     }
     
-    echo(bearings_spacers_height=bearing_spacer_height);
+    //echo(bearings_spacers_height=bearing_spacer_height);
 }
 
 bearing_mount_wall = 8;

lib/rail_mount.scad

 rail_mount_wall = 5;
 rail_mount_len = 10;
 rail_mount_block = 22;
-rail_mount_height = 11;
-
 rail_dia = 8;
 rail_y_off_1 = 10;
-
 cutout_width = 0.5;
 
+rail_mount_height = rail_y_off_1 + 6;
+
 module rail_mount(slot) {
     $fn = 20;
     

xyRepRap.scad

 // ###################### Mechanics ######################
 // #######################################################
 
-rail_mount_dist = 10;
+rail_mount_dist = 12;
+
+module rail(length) {
+    cylinder(d = rail_dia, h = length);
+    echo(rail_dia=rail_dia, rail_len=length);
+}
 
 module y_rails() {
     // y smooth rail on blue side
     color("cyan")
     translate([rail_dia / 2 + rail_y_off_1, 18, -30])
         rotate([-90, 0, 0])
-        cylinder(d = rail_dia, h = outer_length - (2 * slot) - nema17_size - rail_mount_dist);
+        rail(outer_length - slot - nema17_size - (2 * rail_mount_dist));
     
     // some lm8uu bearings on red side
     color("yellow")
     color("cyan")
     translate([outer_width - (2 * slot) - rail_dia / 2 - rail_y_off_1, 18, -30])
         rotate([-90, 0, 0])
-        cylinder(d = rail_dia, h = outer_length - (2 * slot) - nema17_size - rail_mount_dist);
+        rail(outer_length - slot - nema17_size - (2 * rail_mount_dist));
     
     // some lm8uu bearings on red side
     color("yellow")
 module x_rails() {
     translate([30, 200, 15])
         rotate([0, 90, 0])
-        cylinder(d = rail_dia, h = outer_length - (4 * slot));
+        rail(outer_length - (4 * slot));
     translate([30, 200 + x_rail_dist, 15])
         rotate([0, 90, 0])
-        cylinder(d = rail_dia, h = outer_length - (4 * slot));
+        rail(outer_length - (4 * slot));
 }
 
 module motion_xy() {