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 247fc5f..1744810 100644
--- a/src/frames/pieces/box/front-or-back-inner-wall.scad
+++ b/src/frames/pieces/box/front-or-back-inner-wall.scad
@@ -17,7 +17,8 @@ module mount_column_cutout() {
 
 module front_or_back_inner_wall_frame_base_piece() {
 	difference() {
-		front_or_back_box_frame_piece();
+		// Z is scaled so that some part of the original part inner wall is retained
+		scale([1, 1, inner_frame_z_decorative_scale]) 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)
diff --git a/src/frames/pieces/box/side-inner-wall.scad b/src/frames/pieces/box/side-inner-wall.scad
index 5b7d128..596cd50 100644
--- a/src/frames/pieces/box/side-inner-wall.scad
+++ b/src/frames/pieces/box/side-inner-wall.scad
@@ -17,7 +17,8 @@ module mount_column_cutout() {
 
 module side_inner_wall_frame_base_piece() {
 	difference() {
-		side_box_frame_piece();
+		// Z is scaled so that some part of the original part inner wall is retained
+		scale([1, 1, inner_frame_z_decorative_scale]) 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)
diff --git a/src/parameters.scad b/src/parameters.scad
index 32c80e6..578b1d1 100644
--- a/src/parameters.scad
+++ b/src/parameters.scad
@@ -75,6 +75,12 @@ panel_z = 5;
 // inside the frame
 inner_frame_z = frame_z - (panel_z * 2);
 
+// "windowed" pieces chop out the inner wall of the frame as a separate piece in order
+// to print it a different color/way/style. to improve friction fit, it is only the below
+// value scale of the whole wall, so that the rest of the wall is retained on the outer
+// piece, which helps clamp the two together (and helps the panels clamp it all)
+inner_frame_z_decorative_scale = 0.95;
+
 // how much the top plate x/y is expanded to overhang the frame
 // note that this is relative to the top plate (so the wall is added back)
 panel_overhang_amount = 8.5;