diff --git a/multiboard_base.scad b/multiboard_base.scad
index b8a13da..610a8f4 100644
--- a/multiboard_base.scad
+++ b/multiboard_base.scad
@@ -1,6 +1,6 @@
-x_cells = 8;
-y_cells = 6;
-type = "core"; // side or corner
+x_cells = 8; // [1:1:9]
+y_cells = 6; // [1:1:9]
+type = "core"; // [core,side,corner]
 
 // eps = 0.01;
 
@@ -187,6 +187,7 @@ module multiboard_corner_base(x_cells, y_cells) {
 
 
 module multiboard_core(x_cells, y_cells) {
+  render()
   difference() {
     multiboard_core_base(x_cells, y_cells);
 
@@ -206,6 +207,7 @@ module multiboard_core(x_cells, y_cells) {
 }
 
 module multiboard_side(x_cells, y_cells) {
+  render()
   difference() {
     multiboard_side_base(x_cells, y_cells);
 
@@ -225,6 +227,7 @@ module multiboard_side(x_cells, y_cells) {
 }
 
 module multiboard_corner(x_cells, y_cells) {
+  render()
   difference() {
     multiboard_corner_base(x_cells, y_cells);