poster-tube-lid: WallMount wip

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

diff --git a/poster-tube-lid.scad b/poster-tube-lid.scad
index 8b0aa12b3932c9d2ca324544e6338417cc18d130..4af0813a8923220fcbd10246123aa9f57d1eecc0 100644 (file)
--- a/poster-tube-lid.scad
+++ b/poster-tube-lid.scad
@@ -153,7 +153,8 @@ sm_inner_rad = (sm_inner_circum + sm_bolt_tighten_allow/2) / TAU;
 sm_outer_rad = sm_inner_rad + sm_main_thick;
 
 wm_main_width = sm_main_width;
-wm_y_min = sqrt( pow(sm_inner_rad, 2) - pow(wm_thick - sm_main_thick, 2) );
+wm_y_min = sqrt( pow(sm_inner_rad, 2) -
+                pow(sm_inner_rad - (wm_thick - sm_main_thick), 2) );
 
 smc_pos = [ 0, sm_inner_rad, 0 ];