Add gear holder

Gear_Holder.scad

@@ -0,0 +1,33 @@
+RADIUS=5;
+HEIGHT=5;
+CUT_DEPTH=2;
+
+NOTCH_HEIGHT=1;
+NOTCH_RADIUS=RADIUS+0.5;
+
+BOTTOM_HEIGHT=1;
+BOTTOM_RADIUS=RADIUS+1;
+
+$fn = 36;
+
+translate([0, 0, BOTTOM_HEIGHT])
+intersection() {
+    difference() {
+        // inner shaft and nose
+        union() {
+            cylinder(h=HEIGHT, r=RADIUS);
+            translate([0, 0, HEIGHT])
+            cylinder(h=NOTCH_HEIGHT, r=NOTCH_RADIUS);
+        }
+        // cuttin' middle cube
+        translate([0, 0, HEIGHT/2])
+        cube([HEIGHT, HEIGHT*3, HEIGHT*2], center = true);
+    }
+    
+    // surrounding cube
+    translate([0, 0, HEIGHT/2])
+    cube([HEIGHT*3, HEIGHT, HEIGHT*2], center = true);
+}
+
+// ground plate
+cylinder(h=BOTTOM_HEIGHT, r=BOTTOM_RADIUS);