diff --git a/libtest.png b/libtest.png
index 3df7b44..ab9a846 100644
Binary files a/libtest.png and b/libtest.png differ
diff --git a/readme.md b/readme.md
index 5bfc027..6d9f2c2 100644
--- a/readme.md
+++ b/readme.md
@@ -7220,9 +7220,9 @@ allows flexible positioning of the motors.
 ### Modules
 | Module | Description |
 |:--- |:--- |
-| `coreXY(type, size, pos, separation, x_gap = 0, plain_idler_offset = [0, 0], upper_drive_pulley_offset = [0, 0], lower_drive_pulley_offset = [0, 0], show_pulleys = false, left_lower = false)` | Wrapper module to draw both belts of a coreXY setup |
+| `coreXY(type, size, pos, separation, x_gap = 0, plain_idler_offset = [0, 0], upper_drive_pulley_offset = [0, 0], lower_drive_pulley_offset = [0, 0], show_pulleys = false, left_lower = false, motor_back = false)` | Wrapper module to draw both belts of a coreXY setup |
 | `coreXY_belts(type, carriagePosition, coreXYPosBL, coreXYPosTR, separation, x_gap = 0, plain_idler_offset = [0, 0], upper_drive_pulley_offset = [0, 0], lower_drive_pulley_offset = [0, 0], show_pulleys = false, left_lower = false)` | Draw the coreXY belts |
-| `coreXY_half(type, size, pos, separation_y = 0, x_gap = 0, plain_idler_offset = [0, 0], drive_pulley_offset = [0, 0], show_pulleys = false, lower_belt = false, hflip = false)` | Draw one belt of a coreXY setup |
+| `coreXY_half(type, size, pos, separation_y = 0, x_gap = 0, plain_idler_offset = [0, 0], drive_pulley_offset = [0, 0], show_pulleys = false, lower_belt = false, hflip = false, motor_back = false)` | Draw one belt of a coreXY setup |
 
 ![core_xy](tests/png/core_xy.png)
 
@@ -7231,12 +7231,15 @@ allows flexible positioning of the motors.
 | ---:|:--- |:---|
 |   1 | `belt(GT2x6, [ ... ])` |  Belt GT2 x 6mm x 728mm |
 |   1 | `belt(GT2x6, [ ... ])` |  Belt GT2 x 6mm x 790mm |
-|   7 | `pulley(GT2x16_toothed_idler)` |  Pulley GT2 idler 16 teeth |
-|   3 | `pulley(GT2x16_plain_idler)` |  Pulley GT2 idler smooth 9.63mm |
-|   2 | `pulley(GT2x20ob_pulley)` |  Pulley GT2OB 20 teeth |
+|   1 | `belt(GT2x6, [ ... ])` |  Belt GT2 x 6mm x 826mm |
+|   1 | `belt(GT2x6, [ ... ])` |  Belt GT2 x 6mm x 826mm |
+|   2 | `belt(GT2x6, [ ... ])` |  Belt GT2 x 6mm x 836mm |
+|  15 | `pulley(GT2x16_toothed_idler)` |  Pulley GT2 idler 16 teeth |
+|  15 | `pulley(GT2x16_plain_idler)` |  Pulley GT2 idler smooth 9.63mm |
+|   6 | `pulley(GT2x20ob_pulley)` |  Pulley GT2OB 20 teeth |
 |   8 | `screw(M3_cap_screw, 20)` |  Screw M3 cap x 20mm |
-|   4 | `screw(M3_grub_screw, 6)` |  Screw M3 grub x  6mm |
-|   2 | `NEMA(NEMA17_40)` |  Stepper motor NEMA17 x 40mm (5x20 shaft) |
+|  12 | `screw(M3_grub_screw, 6)` |  Screw M3 grub x  6mm |
+|   6 | `NEMA(NEMA17_40)` |  Stepper motor NEMA17 x 40mm (5x20 shaft) |
 
 
 <a href="#top">Top</a>
diff --git a/tests/core_xy.scad b/tests/core_xy.scad
index 58a3d0d..ef1be29 100644
--- a/tests/core_xy.scad
+++ b/tests/core_xy.scad
@@ -136,10 +136,10 @@ module coreXY_motor_in_back_test1() {
     size = [200,200];
     pos = [100,100];
     separation = [20,5,10];
-    
+
 
     coreXY(coreXY_GT2_20_16, size, pos, separation, x_gap = 0, plain_idler_offset = [0, 0], upper_drive_pulley_offset = [0, 0], lower_drive_pulley_offset = [0, 0], show_pulleys = true, left_lower = false, motor_back = true);
-    
+
     rotate([180,0,0])
     translate (
         [ separation.x/2
@@ -159,16 +159,16 @@ module coreXY_motor_in_back_test2() {
     separation = [0,5,10];
     upper_drive_pulley_offset = [20, 5];
     lower_drive_pulley_offset = [20, 5];
-    
+
 
     coreXY(coreXY_GT2_20_16, size, pos, separation, x_gap = 0, plain_idler_offset = [20, 0], upper_drive_pulley_offset, lower_drive_pulley_offset, show_pulleys = true, left_lower = false, motor_back = true);
-    
+
     translate (
         [ size.x - separation.x/2 - lower_drive_pulley_offset.x
         , lower_drive_pulley_offset.y
         , -separation.z/2 - 15 ])
     NEMA(NEMA17_40);
-    
+
     translate (
         [ separation.x/2 + upper_drive_pulley_offset.x
         , upper_drive_pulley_offset.y
@@ -177,10 +177,12 @@ module coreXY_motor_in_back_test2() {
 }
 
 
-if ($preview)
+if ($preview) {
     coreXY_belts_test();
+
     translate ([-250, 0,0])
         coreXY_motor_in_back_test1();
-        
+
     translate ([-250, -250,0])
         coreXY_motor_in_back_test2();
+}
diff --git a/tests/png/core_xy.png b/tests/png/core_xy.png
index b46225b..2974f1b 100644
Binary files a/tests/png/core_xy.png and b/tests/png/core_xy.png differ