1 files changed, 8 insertions, 4 deletions

diff --git a/fanduct.scad b/fanduct.scad
index 563920c..421dd5a 100644
--- a/fanduct.scad
+++ b/fanduct.scad
@@ -5,5 +5,9 @@ epsilon=.005;		// for finer cuts
 
-        heater_w = 16;  // heatblock width
-        heater_l = 20;  // heatblock length
-        nozzle_offset=4.5;// nozzle offset from the edge of heatblock
+function hypothenuse(a,b) = sqrt(pow(a,2)+pow(b,2));
+
+silicone_shell = 2;
+heater_clearance = max(
+                hypothenuse(16/2     +silicone_shell, 20-4.5 +silicone_shell),// E3D v6
+                hypothenuse(11.5-4.5 +silicone_shell, 15.5   +silicone_shell)// E3D volcano
+);
 
@@ -14,3 +18,3 @@ fanduct_w = 7;								// inner width of the duct
         fanduct_shell=1.2;                                              // shell thickness
-        fanduct_ir = sqrt(pow(heater_w/2,2)+pow(heater_l-nozzle_offset,2))+5;// inner radius
+        fanduct_ir = heater_clearance+5;                                // inner radius