poster-tube-lid: convert to oring: provide oring_oblate

diff --git a/poster-tube-lid.scad b/poster-tube-lid.scad
index 33d008f481287cf08c33029577e8d47c1bace1d5..ba3fc60ec41d6e444037b67593abf35c63fd36db 100644 (file)
--- a/poster-tube-lid.scad
+++ b/poster-tube-lid.scad
@@ -50,8 +50,10 @@ bayo_inramp_z = bayo_entry;
 oring_mid_dia = oring_bore + oring_thick;
 oring_outer_dia = oring_mid_dia + oring_thick;
 
-oring_y_rad = oring_thick/2 * (1 - oring_compress);
-oring_x_rad = oring_thick/2 / (1 - oring_compress);
+oring_oblate = (1 - oring_compress);
+
+oring_y_rad = oring_thick/2 * oring_oblate;
+oring_x_rad = oring_thick/2 / oring_oblate;
 
 seal_thick = oring_y_rad * (1 + cos(oring_upper_embed_angle));