poster-tube-lid: fix

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/poster-tube-lid.scad b/poster-tube-lid.scad
index 3bb15b6014f659f6223548bfe5db865c019f960a..659af078cc176a9e83d8ba78e79a2afe412b7530 100644 (file)
--- a/poster-tube-lid.scad
+++ b/poster-tube-lid.scad
@@ -209,7 +209,10 @@ function wmb_screw_thing_y_min(dia) = sqrt(
                       pow(wmb_x_screw + dia/2, 2)
                       );
 wmb_y_screw_end = wmb_screw_thing_y_min(wmb_screw_dia);
-wmb_y_nut_min = wmb_screw_thing_y_min(wmb_nut_across + wmb_nut_around_min*2);
+wmb_y_nut_min = max(
+    wmb_screw_thing_y_min(wmb_nut_across + wmb_nut_around_min*2),
+    wm_y_slot1_max
+                   );
 wmb_y_mount_max = max(
                      wmb_y_nut_min + wmb_nut_th + wmb_nut_behind_min,
                      wmb_y_screw_end + wmb_screw_depth_min