diff --git a/TODO.md b/TODO.md
index c982146..92c2ba0 100644
--- a/TODO.md
+++ b/TODO.md
@@ -2,7 +2,7 @@
 
 * Add place to mount electronics (likely just an extra part)
 * add slot for motor electronic connection
-* Raise motor mount on front left motor
+* Raise motor mount on front left corner
 
 ## Electronics
 
diff --git a/assembly.scad b/assembly.scad
index a506b4c..dd9bccc 100644
--- a/assembly.scad
+++ b/assembly.scad
@@ -8,13 +8,13 @@ module frame() {
       tslot(xsize - 2 * corner_offset);
 
   translate([ 0, corner_offset, 0 ]) rotate([ -90, 0, 0 ])
-      tslot(ysize - 2 * corner_offset);
+      tslot(ysize - 2 * corner_offset - rail_holder_width + wall_thickness);
 
-  translate([ corner_offset, ysize, 0 ]) rotate([ 0, 90, 0 ])
-      tslot(xsize - 2 * corner_offset);
+  translate([ frame_size/2 + rail_holder_width, ysize, 0 ]) rotate([ 0, 90, 0 ])
+      tslot(xsize - frame_size - rail_holder_width * 2);
 
   translate([ xsize, corner_offset, 0 ]) rotate([ -90, 0, 0 ])
-      tslot(ysize - 2 * corner_offset);
+      tslot(ysize - 2 * corner_offset - rail_holder_width + wall_thickness);
 }
 module corners() {
   translate([ 0, 0 ]) flcorner();
@@ -76,9 +76,15 @@ union() {
   moving_parts();
 }
 
-*intersection() {
-  ysled_slider(spread=sled_ysize);
-  translate([0, -1000, -1000])
-  cube([2000, 2000, 2000]);
+*union() {
+  rails();
+  frame();
+  intersection() {
+    union() {
+      corners();
+    }
+    translate([-1000, - 1000, -1000])
+      cube([2000, 2000, 1000]);
+  }
 }
 *xsled2();
\ No newline at end of file
diff --git a/parts.scad b/parts.scad
index db88d72..33aab88 100644
--- a/parts.scad
+++ b/parts.scad
@@ -23,7 +23,7 @@ belt_height2 = belt_height1 + belt_width + 2;
 
 ysled_rail_spacing = (sled_ysize);
 motor_shaft_xoffset = 15;
-motor_mount_length_adjustment = 4;
+motor_mount_length_adjustment = 8;
 motor_mount_length = nema17_face + wall_thickness + motor_mount_length_adjustment;
 
 // distance between centerline of rail and centerline of frame Y tube.
@@ -70,7 +70,7 @@ module corner_base(extension = wall_thickness) {
     }
 
     // Adjustable feet
-    cylinder(d=8, h=odim * 2 + 1, $fn = screw_num_sides);
+    cylinder(d=8, h=odim * 2 + 1, center=true, $fn = screw_num_sides);
   }
 }
 
@@ -169,17 +169,19 @@ module nema17_housing() {
   hwidth = corner_size + frame_size + wall_thickness;
   hheight = nema17_face + wall_thickness * 2;
   hdepth = frame_size + wall_thickness * 2;
+  vertical_extension = frame_size + belt_height2;
 
   screw_dxy = 31 / 2;
+  slot_vector = [0, - motor_mount_length_adjustment, 0];
 
   translate([ 0, -nema17_face / 2 - frame_size / 2 - wall_thickness, 0 ]) {
-    slotify([0, - motor_mount_length_adjustment, 0]) {
-      translate([ 0, 0, -2 ])
-        cube([ nema17_face + 1, nema17_face + 1, hdepth ], center = true);
+    slotify(slot_vector) {
+      translate([ 0, 0, -belt_height2/2 - wall_thickness ])
+        cube([ nema17_face + 1, nema17_face + 1, hdepth + belt_height2 ], center = true);
       cylinder(d = 23, frame_size);
     }
     for (x = [-1, 1], y = [-1,1]) {
-      slotify([0, - motor_mount_length_adjustment, 0])
+      slotify(slot_vector)
       translate([
           x * screw_dxy,
           y * screw_dxy,
@@ -232,6 +234,7 @@ module idler_post(belt_height, toothed = true) {
 
 module flcorner() {
   bom_item();
+  motor_height = belt_height2 - belt_height1;
   union() {
     rotate([ 0, 0, 0 ]) {
       corner_base();
@@ -245,10 +248,10 @@ module flcorner() {
         ])
         cube([
           frame_size + wall_thickness + corner_size,
-          motor_mount_length,
-          frame_size + wall_thickness * 2
+          motor_mount_length + wall_thickness,
+          frame_size + wall_thickness * 2 + motor_height
           ]);
-      translate([ motor_shaft_xoffset, 0, 0 ]) nema17_housing();
+      translate([ motor_shaft_xoffset, 0, motor_height ]) nema17_housing();
 
     }
 //    translate([motor_shaft_xoffset, 0, 0 ]) nema17_housing();
@@ -258,8 +261,11 @@ module flcorner() {
       motor_shaft_xoffset,
       -nema17_face / 2 - frame_size / 2 - wall_thickness, frame_size / 2
     ]) {
-      nema17();
-      translate([ 0, 0, -frame_size / 2 + belt_height2 ]) { active_pulley(); }
+      translate([0,0,motor_height])
+        nema17();
+      translate([ 0, 0, -frame_size / 2 + belt_height2 ])
+      rotate([180,0,0])
+        { active_pulley(); }
     }
 }
 
@@ -312,13 +318,13 @@ module blcorner() {
       cylinder(d = 3, h = belt_height2, $fn=screw_num_sides);
     }
   }
-  translate([motor_shaft_xoffset + pulley_sbend_offset, 0, 0])
+  translate([motor_shaft_xoffset + pulley_sbend_offset, 0, frame_size/2])
   rotate([0,0,-90])
-  idler_post(belt_height = belt_height1, toothed=true);
+  idler_post(belt_height = belt_height1 - frame_size/2, toothed=true);
 
-  translate([0, -(motor_shaft_xoffset + pulley_sbend_offset), 0])
+  translate([0, -(motor_shaft_xoffset + pulley_sbend_offset), frame_size/2])
   rotate([0,0,-90])
-  idler_post(belt_height = belt_height2, toothed=true);
+  idler_post(belt_height = belt_height2 - frame_size/2, toothed=true);
 }
 
 module brcorner() {
@@ -328,13 +334,13 @@ module brcorner() {
     corner_base(extension = rail_holder_width);
     rail_holder(false);
   }
-  translate([-(motor_shaft_xoffset + pulley_sbend_offset), 0, 0])
+  translate([-(motor_shaft_xoffset + pulley_sbend_offset), 0, frame_size/2])
   rotate([0,0,180])
-  idler_post(belt_height = belt_height2, toothed=true);
+  idler_post(belt_height = belt_height2 - frame_size/2, toothed=true);
 
-  translate([0, -(motor_shaft_xoffset + pulley_sbend_offset), 0])
+  translate([0, -(motor_shaft_xoffset + pulley_sbend_offset), frame_size/2])
   rotate([0,0,180])
-  idler_post(belt_height = belt_height1, toothed=true);
+  idler_post(belt_height = belt_height1 - frame_size/2, toothed=true);
 }
 
 module xsled_slider() {