diff --git a/scad/canon_ef_m_bellows_mount.scad b/scad/canon_ef_m_bellows_mount.scad
new file mode 100644
index 0000000..e6fe6d8
--- /dev/null
+++ b/scad/canon_ef_m_bellows_mount.scad
@@ -0,0 +1,13 @@
+include <./ef_m_mount_v3.scad>;
+include <./common/common.scad>;
+
+difference () {
+	union () {
+		ef_m_mount(thickness=2,grip = true);
+		translate([0, 0, -3]) cylinder(r = 38.5 / 2, h = 10, center = true, $fn = 360);
+	}
+	//guide
+	translate([0, 0, -3]) rotate([0, 0, 8.75]) translate([0, -26, 0]) cylinder(r = R(3), h = 4, center= true);
+	//center void
+	cylinder(r = 32 / 2, h = 30, center = true, $fn = 360);
+}
\ No newline at end of file
diff --git a/scad/ef_m_mount_v3.scad b/scad/ef_m_mount_v3.scad
new file mode 100644
index 0000000..7e5fa3e
--- /dev/null
+++ b/scad/ef_m_mount_v3.scad
@@ -0,0 +1,132 @@
+/*
+*
+* Canon EF-M lens-side mount
+*
+* Remix of Canon EF-M lens mount by Peter K. Johnson (PPK):
+* https://www.thingiverse.com/thing:703383
+*
+* Added optional thickness parameter (default is 0) to add depth to the large
+*     circle.
+* Added grip texture option to outer edge
+*
+* Created EF-M pinhole module which builds a variable focal length 
+* EF-M pinhole lens with a slot to accept a pinhole.
+*
+* brett stevens 2021.
+*/
+
+/*
+// constants from Fotasy adapter mount
+
+outer_diam_1 = 54;
+outer_diam_2 = 46.8;
+outer_diam_3 = 42.88;
+
+inner_diam = 41.28;
+
+// constants from Canon mount
+
+outer_diam_1 = 58.0;
+outer_diam_2 = 47.0;
+outer_diam_3 = 43.0;
+
+*/
+
+outer_diam_1 = 58.0;
+outer_diam_2 = 47.0;
+outer_diam_3 = 43.0;
+
+pin_hole_width = 2.2;
+
+// Partial rotate extrude from: http://www.thingiverse.com/thing:34027
+module pie_slice(radius, angle, step) {
+	for(theta = [0:step:angle-step]) {
+		rotate([0,0,0])
+		linear_extrude(height=radius*2, center=true)
+		polygon( 
+			points = [
+				[0,0],
+				[radius*cos(theta+step), radius*sin(theta+step)],
+				[radius*cos(theta), radius*sin(theta)]
+			]
+		);
+	}
+}
+module partial_rotate_extrude(angle, radius, convex) {
+	intersection () {
+		rotate_extrude(convexity=convex) translate([radius,0,0]) children(0);
+		pie_slice(radius*2, angle, angle/5);
+	}
+}
+
+
+// Canon EF-M lens mount
+
+module ef_m_bayonet_section(angle) {
+	partial_rotate_extrude(angle, outer_diam_3/2-0.1, 10)
+		polygon([[0,-2.2],[0,0],[1.6,0],[1.6,-1.6]]);
+}
+module ef_m_mount( thickness = 0, grip = false) {
+	$fa = 0.01;
+    $fn = 200;
+	union() {
+		difference() {
+            if (grip)
+            difference() {    
+			    translate([0, 0, -thickness])
+				    cylinder(h=2+thickness, d=outer_diam_1);
+                {
+                    for(i = [0:100-1])
+                    {
+                        rotate([0,0,i*360/100])
+                        translate([outer_diam_1/2,0,-1.75-thickness])
+                        cylinder(thickness+0.5+2,r=0.5);
+                    } 
+                 }
+             }
+            else
+			translate([0, 0, -thickness])
+				cylinder(h=2+thickness, d=outer_diam_1);
+            
+			rotate(a=[0, 0, -22])
+				translate([49/2, -pin_hole_width/2, 1.1])
+					cube([4, pin_hole_width, 1.1]);
+			rotate(a=[0, 0, -83])
+				translate([outer_diam_1/2-2.5, 0, 1.5])
+					cube([1.5, 1.5, 0.6]);
+		}
+		translate([0, 0, 2])
+			cylinder(h=1.6, d=outer_diam_2);
+		difference() {
+			translate([0, 0, 0])
+				cylinder(h=7.6, d=outer_diam_3);
+			translate([0, 0, 7.6])
+				rotate(a=[0, 0, 40])
+					partial_rotate_extrude(140, 34.5/2, 10)
+						polygon([[0,-1],[0,0.1],[2.5,0.1],[2.5,-1]]);
+		}
+		translate([0, 0, 7.6]) {
+			partial_rotate_extrude(3, outer_diam_3/2-.1, 10)
+				polygon([[0,-4],[0,0],[1.4,0],[1.4,-4]]);
+			ef_m_bayonet_section(58);
+			rotate(a=[0, 0, 131])
+				ef_m_bayonet_section(51);
+			rotate(a=[0, 0, 243])
+				ef_m_bayonet_section(51);
+		}
+	}
+}
+
+// Example with typical EF-M hole, but that part can be modified as needed for
+// whatever final assembly is being made.  There's a subtle alignment dot built
+// into the base mount (on the camera side), but if a more visible one is desired
+// on a larger assembly it should be at -83 degrees relative to the mount.
+//difference() {
+//	ef_m_mount();
+//	translate([0,0,-1]) cylinder(h=10, d=32);
+//}
+$fn = 200;
+overlap = 0.1;
+
+
+