Add unfuck-the-mmu spool feed designs

unfuck the mmu/loop.scad

@@ -0,0 +1,52 @@
+$screw_offset = 0; // 26
+$ptfe_hole_diameter = 4.4; // 4.1
+
+difference() {
+    union() {
+        box1();
+        
+        translate([0, 0, 10])
+        rotate([90, 0, 0])
+        torus(i=7, o=15, xs=0.4, ys=1.5, $fn=100);
+    }
+    
+    translate([0, $screw_offset, 3.70])
+    cube([5.6, 3.235, 2.61], center=true);
+    
+    translate([0, $screw_offset, 3.70])
+    rotate([0, 0, 60])
+    cube([5.6, 3.235, 2.61], center=true);
+    
+    translate([0, $screw_offset, 3.70])
+    rotate([0, 0, -60])
+    cube([5.6, 3.235, 2.61], center=true);
+    
+    translate([0, $screw_offset, 0])
+    cylinder(h=10, d=3.2, center=true, $fn=100);
+    
+    translate([0, $screw_offset, -4.5])
+    cylinder(h=1.01, d=4.4, center=true, $fn=100);
+}
+
+
+module box1() {
+    hull() {
+        for (x = [-8, 8]) {
+            for (y = [-4, 4]) {
+                for (z = [-3, 3]) {
+                    translate([x, y, z])
+                    sphere(d=4, $fn=100);
+                }
+            }
+        }
+    }
+}
+
+module torus(i, o, xs=1.0, ys=1.0) {
+    r = (o - i) / 2;
+
+    rotate_extrude()
+    translate([i + r, 0, 0])
+    scale([xs, ys, 1.0])
+    circle(r);
+}