diff --git a/Motorhalter.scad b/Motorhalter.scad
index cb68428..db857f1 100644
--- a/Motorhalter.scad
+++ b/Motorhalter.scad
@@ -13,7 +13,7 @@ leftholedist=7;
 M3HoleDiam=3.4;
 M3HeadDiam=5.8;
 
-difference() {
+render() difference() {
     mainbody();
     translate([motorwidth,wanddickelinks,0]) motorholes();
     leftholes();
diff --git a/YRollHolder.scad b/YRollHolder.scad
new file mode 100644
index 0000000..bc08d26
--- /dev/null
+++ b/YRollHolder.scad
@@ -0,0 +1,41 @@
+$fn=33;
+
+M3HoleDiam=3.4;
+
+height=40;
+thickness=3;
+length=30;
+
+// cambelt has 6mm width
+innerspace=8;
+
+render() difference() {
+    frame();
+    holes();
+}
+
+module frame() {
+    cube([innerspace + 2 * thickness,thickness,height]);
+    translate([0, thickness, 0]) cube([thickness, length, height]);
+    translate([innerspace + thickness, thickness, 0]) cube([thickness, length, height]);
+    
+    
+}
+
+module holes(){
+    // two inner holes
+    translate([innerspace / 2 + thickness, 0, height / 4]) M3Hole();
+    translate([innerspace / 2 + thickness, 0, height / 4 * 3]) M3Hole();
+    
+    translate([0, length / 4 *3, height / 2]) SideM3Hole();
+    
+    translate([innerspace + thickness, length / 4 * 3, height / 2]) SideM3Hole();
+}
+
+module M3Hole() {
+    rotate([0,90,90])cylinder(h=thickness, d=M3HoleDiam);
+}
+
+module SideM3Hole() {
+    rotate([0,90,0])cylinder(h=thickness, d=M3HoleDiam);
+}
\ No newline at end of file
diff --git a/angle_bracket.scad b/angle_bracket.scad
index efdfb11..2511ab3 100644
--- a/angle_bracket.scad
+++ b/angle_bracket.scad
@@ -4,7 +4,8 @@ height=40;
 width=60;
 b=3;
 triagleheight=5;
-M3HoleDiam=3.4;
+
+M4HoleDiam=4.4;
 
 holedistance=10;
 
@@ -46,9 +47,9 @@ module stabilizetriangle() {
 }
 
 module YM3Hole() {
-    rotate([0,90,0])cylinder(h=b, d=M3HoleDiam);
+    rotate([0,90,0])cylinder(h=b, d=M4HoleDiam);
 }
 
 module XM3Hole() {
-    rotate([270,0,0])cylinder(h=b, d=M3HoleDiam);
+    rotate([270,0,0])cylinder(h=b, d=M4HoleDiam);
 }