diff --git a/Neptune4/filament_detector_guide.scad b/Neptune4/filament_detector_guide.scad
index b1e73fa..a3dc6b1 100644
--- a/Neptune4/filament_detector_guide.scad
+++ b/Neptune4/filament_detector_guide.scad
@@ -14,7 +14,7 @@ base_det_screw_l = 30;
 base_det_screw_d = 3.5;
 base_det_screw_head = 6;
 
-det_offset = 4; // offset to the left, because the Elegoo filament detector is not centered
+det_offset = 0; // NO offset to the left, because the Elegoo filament detector IS centered
 
 
 difference() {
@@ -28,7 +28,7 @@ difference() {
         // hole for screw for filament detector
         ycyl(d=base_det_screw_d, h=base_dim[1]);
         // hole for the screw head
-        back(base_det_screw_l - 10) ycyl(d=base_det_screw_head, h=base_dim[1]);
+        back(base_det_screw_l - 15) ycyl(d=base_det_screw_head, h=base_dim[1]);
     }
     
 }