diff --git a/src/frames/pieces/box/front-or-back-inner-wall.scad b/src/frames/pieces/box/front-or-back-inner-wall.scad
index a4acb5f..6a076c8 100644
--- a/src/frames/pieces/box/front-or-back-inner-wall.scad
+++ b/src/frames/pieces/box/front-or-back-inner-wall.scad
@@ -8,16 +8,23 @@ include <parameters.scad>
 include <components.scad>
 use <front-or-back.scad>
 
+module mount_column_cutout() {
+	intersection() {
+		frame_mount_column();
+		cube([frame_mount_column_width*3/2, frame_mount_column_width*3/2, inner_frame_z*5/8], center=true);
+	}
+}
+
 module front_or_back_inner_wall_frame_piece() {
 	difference() {
 		front_or_back_box_frame_piece();
 		// minus the outer wall
 		translate([0, -(frame_y-frame_wall)/2, 0]) cube([frame_x, frame_wall, frame_z], center=true);
 		// minus half of the mounting posts (the other half provided by the outer wall)
-		translate([-panel_to_frame_point_x, -(panel_to_frame_point_y), frame_z/2]) rotate([0, 0, 180])
-			frame_mount_column();
-		translate([panel_to_frame_point_x, -(panel_to_frame_point_y), -frame_z/2]) rotate([0, 0, 270])
-			frame_mount_column();
+		translate([-panel_to_frame_point_x, -(panel_to_frame_point_y), 0]) rotate([0, 0, 180])
+			mount_column_cutout();
+		translate([panel_to_frame_point_x, -(panel_to_frame_point_y), 0]) rotate([0, 0, 270])
+			mount_column_cutout();
 	}
 }
 
diff --git a/src/frames/pieces/box/side-inner-wall.scad b/src/frames/pieces/box/side-inner-wall.scad
index 74b0b06..f4af457 100644
--- a/src/frames/pieces/box/side-inner-wall.scad
+++ b/src/frames/pieces/box/side-inner-wall.scad
@@ -8,16 +8,27 @@ include <parameters.scad>
 include <components.scad>
 use <side.scad>
 
+module mount_column_cutout() {
+	intersection() {
+		frame_mount_column();
+		cube([frame_mount_column_width*3/2, frame_mount_column_width*3/2, inner_frame_z*21/24], center=true);
+	}
+}
+
 module side_inner_wall_frame_piece() {
 	difference() {
 		side_box_frame_piece();
 		// minus the outer wall
 		translate([-(frame_x-frame_wall)/2, 0, 0]) cube([frame_wall, frame_y, frame_z], center=true);
 		// minus half of the mounting posts (the other half provided by the outer wall)
-		translate([-panel_to_frame_point_x, panel_to_frame_point_y, frame_z/2]) rotate([0, 0, 90])
-			frame_mount_column();
-		translate([-panel_to_frame_point_x, -(panel_to_frame_point_y), -frame_z/2]) rotate([0, 0, 180])
-			frame_mount_column();
+		translate([-panel_to_frame_point_x, panel_to_frame_point_y, inner_frame_z/2]) rotate([0, 0, 90])
+			mount_column_cutout();
+		translate([-panel_to_frame_point_x, -(panel_to_frame_point_y), -inner_frame_z/2]) rotate([0, 0, 180])
+			mount_column_cutout();
+		translate([-panel_to_frame_point_x, panel_to_frame_point_y, -inner_frame_z/2]) rotate([0, 0, 90])
+			mount_column_cutout();
+		translate([-panel_to_frame_point_x, -(panel_to_frame_point_y), inner_frame_z/2]) rotate([0, 0, 180])
+			mount_column_cutout();
 	}
 }