diff --git a/centrifuge.scad b/centrifuge.scad
index 3e045fc..b2772b6 100644
--- a/centrifuge.scad
+++ b/centrifuge.scad
@@ -7,7 +7,7 @@ BASE_UPPER_DIAMETER=50;
 TEST_TUBE_HEIGHT=150;
 TEST_TUBE_DIAMETER=10;
 TEST_TUBE_ANGLE=33;
-TEST_TUBE_SPREAD=100;
+TEST_TUBE_SPREAD=90;
 
 module testTube(height, diameter) {
 	cylinder(height, diameter, diameter);