diff --git a/CFTubes.scad b/CFTubes.scad
index 8ca9927..51d17a8 100644
--- a/CFTubes.scad
+++ b/CFTubes.scad
@@ -374,16 +374,16 @@ module Nylon6String() {
 			translate([-100, x1, -100]) cube([200, xn-x1, 200]);
 			for (m=[0,11]) mirror([m, 0, 0]) color([0.4, 0.5, 0.5]) translate([9, 0, -16+(CF_Square_Width*2)]) CFSquareCutout(x0, x1, taper_length=2);
 			translate([ 12,0,-14]) CFSquareCutout(x0, x1, taper_length=2);
-			translate([ 12-CF_Square_Width,0,-14]) CFSquareCutout(x0, x1-15, taper_length=2, taper_x2=false);
+			translate([ 12-CF_Square_Width,0,-14]) CFSquareCutout(x0, x1-8, taper_length=2, taper_x2=false);
 			translate([-12,0,-14]) CFSquareCutout(x0, x1, taper_length=2);
-			translate([-12+CF_Square_Width,0,-14]) CFSquareCutout(x0+15, x1, taper_length=2, taper_x1=false);
+			translate([-12+CF_Square_Width,0,-14]) CFSquareCutout(x0+8, x1, taper_length=2, taper_x1=false);
 			translate([20,0,-6]) CFTubeCutout(x0, x1, taper_length=2);
 		}
 	}
 	difference(){
 		NeckFragment(2, 3);
 		translate([-20,0,-1]) rotate([-90,180,180]) linear_extrude(3, center=true) text("PETG", size=3.5, halign="center", valign="center");
-		translate([-20,0,-6]) rotate([-90,180,180]) linear_extrude(3, center=true) text("1", size=3.5, halign="center", valign="center");
+		translate([-20,0,-6]) rotate([-90,180,180]) linear_extrude(3, center=true) text("1α", size=3.5, halign="center", valign="center");
 	}
 
 	// translate([0,0,30]) difference() {
diff --git a/CFTubes/PETG.scad b/CFTubes/PETG.scad
index 20f71d1..2c81692 100644
--- a/CFTubes/PETG.scad
+++ b/CFTubes/PETG.scad
@@ -1,2 +1,2 @@
-CF_Square_Width_tolerance = 0.2;  // Untested
-CF_Tube_OD_tolerance = 0.3;  // Untested
+CF_Square_Width_tolerance = 0.16;  // 0.2 slightly loose on 0.08mm Extra Fine wetg
+CF_Tube_OD_tolerance = 0.24;  // 0.3 slightly loose on 0.08mm Extra Fine wetg