commit 7bb8b65e5456d3cad904c8c1a9d22c7b0a31eed4
Author: Ian Gulliver <github@flamingcow.io>
Date:   Sun Jul 12 11:43:06 2026 -0700

    Initial import

diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..8504958
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,4 @@
+*.stl filter=lfs diff=lfs merge=lfs -text
+*.STL filter=lfs diff=lfs merge=lfs -text
+*.3mf filter=lfs diff=lfs merge=lfs -text
+*.png filter=lfs diff=lfs merge=lfs -text
diff --git a/2020 8mm cap.scad b/2020 8mm cap.scad
new file mode 100644
index 0000000..e321616
--- /dev/null
+++ b/2020 8mm cap.scad	
@@ -0,0 +1,63 @@
+$fn = 500;
+
+//cylinder(h=10, d=11);
+// 4.5 thick under screw
+// 12 diameter screw head hole (~10.8 screw head)
+
+e = 0.02;
+w = 50.8;
+
+difference() {
+    union() {
+        hull() {
+            for (x=[0, 15], y=[0, w - 1])
+            translate([x, y, 0]) {
+                translate([0.5, 0.5, 0])
+                cylinder(h=1, d=1);
+                
+                translate([0.5, 0.5, 1.0])
+                sphere(d=1);
+            }
+            
+            for (x=[0, 15])
+            translate([x, 0, 0]) {
+                translate([0.5, w / 2, 15])
+                rotate([0, 90, 0])
+                rotate_extrude()
+                translate([7, 0, 0])
+                circle(d=1);
+             }
+        }
+
+        for (x=[-0.25, 11.25], y=[12.7 - (6.5 / 2), w - 12.7 - (6.5 / 2)]) {
+            translate([x, y, 0])
+            rotate([-90, 0, 0])
+            intersection() {
+                translate([0.5, -0.5, 0])
+                hull()
+                for (p=[[0, 0], [1.5, 1.5], [2.5, 1.5], [4, 0]]) {
+                    translate([p[0], p[1], 0])
+                    cylinder(h=6.5, d=1);
+                }
+                
+                cube([10, 10, 10]);
+            }
+        }
+    }
+    
+    translate([-e, w / 2, 15])
+    rotate([0, 90, 0])
+    cylinder(h=10, d1=8.2, d2=8.1);
+    
+    for (y=[12.7, w - 12.7])
+    translate([0, y, 0]) {
+        translate([8, 0, -e]) {
+            cylinder(h=20, d=6.8);
+            
+            translate([0, 0, 4])
+            cylinder(h=20, d=12);
+        }
+    }
+}
+
+        
\ No newline at end of file
diff --git a/2020 8mm cap.stl b/2020 8mm cap.stl
new file mode 100644
index 0000000..30a6a69
--- /dev/null
+++ b/2020 8mm cap.stl	
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:6e88af6930d667f91ea5c75cf30da960271b4a23529b087b13ee86abefabf51b
+size 37608424
diff --git a/2020 wheel truck.scad b/2020 wheel truck.scad
new file mode 100644
index 0000000..60f18a2
--- /dev/null
+++ b/2020 wheel truck.scad	
@@ -0,0 +1,44 @@
+// ECHO: "max_radius=", 13.6
+// ECHO: "total_height=", 28.9
+
+// clearance radius = 4 + 13.6 = 17.6
+// clearance diameter = 17.6 * 2 = 35.2
+
+// 2020 width is 50.8
+
+// linear bearing od=15, l=24
+
+// 15 + 15 + 35.2 = 65.2 === can't go side-by-side
+
+$fn = 500;
+
+difference() {
+    color("red", 0.7)
+    hull() {
+        for(y=[6, 44.8], z=[6, 34.5]) {
+            translate([0, y, z])
+            rotate([0, 90, 0])
+            cylinder(h=54, r=6);
+        }
+    }
+    
+    for (y=[9.4, 41.4]) {
+        translate([-1, y, 9])
+        rotate([0, 90, 0])
+        cylinder(h=60, d=13);
+    }
+    
+    for (x=[2, 28], y=[9.4, 41.4]) {
+        translate([x, y, 9])
+        rotate([0, 90, 0])
+        cylinder(h=24, d=15);
+    }
+    
+    translate([12, (50.8 / 2), 34])
+    rotate([0, 90, 0])
+    cylinder(h=30, r=20);
+    
+    translate([2, (50.8 / 2), 34])
+    rotate([0, 90, 0])
+    cylinder(h=50, d=8);
+}
\ No newline at end of file
diff --git a/2020 wheel-c.stl b/2020 wheel-c.stl
new file mode 100644
index 0000000..4b26863
--- /dev/null
+++ b/2020 wheel-c.stl	
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9b7b96d9df4d8b467f2aa9f126836d3545306d030d422fdae2af230ecc188c62
+size 2263467
diff --git a/2020 wheel-w.stl b/2020 wheel-w.stl
new file mode 100644
index 0000000..a51deec
--- /dev/null
+++ b/2020 wheel-w.stl	
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:4242764703d1d342bbd6ac962e2294051394f4d422cc33be880115e19cd0f2b0
+size 1688107
diff --git a/2020 wheel.scad b/2020 wheel.scad
new file mode 100644
index 0000000..9778aee
--- /dev/null
+++ b/2020 wheel.scad	
@@ -0,0 +1,107 @@
+$fn = 300;
+
+// * c w
+part = "w";
+
+slot_center_spacing = 25.4;
+
+
+ramp_height = 5;
+ramp_slot_mid = 4.25;
+ramp_depth = 2.5;
+
+deramp_height = 1;
+deramp_depth = (ramp_depth / ramp_height) * (ramp_height - deramp_height);
+
+bearing_radius = 8.1;
+bearing_underhang = 1;
+bulk_radius = 4;
+
+bearing_height = 5;
+bearing_count = 2;
+
+core_radius = 9.5;
+core_bump_radius = 1;
+core_bump_height = 2;
+
+e = 0.02;
+
+inner_radius = bearing_radius - bearing_underhang;
+echo("inner_radius=", inner_radius);
+
+outer_radius = inner_radius + bulk_radius;
+echo("outer_radius=", outer_radius);
+
+echo("max_radius=", outer_radius + ramp_depth);
+
+mid = slot_center_spacing - ramp_slot_mid - ramp_slot_mid;
+
+total_height = deramp_height + ramp_height + mid + ramp_height + deramp_height;
+echo("total_height=", total_height);
+
+bearing_portion = mid / bearing_count;
+
+if (part == "*" || part == "c") {
+    color("grey", 0.6)
+    intersection() {
+        wheel();
+        core_mask();
+    }
+}
+
+if (part == "*" || part == "w") {
+    color("red", 0.6)
+    difference() {
+        wheel();
+        core_mask();
+    }
+}
+
+module core_mask() {
+    rotate_extrude()
+    polygon([
+        [0, total_height + e],
+        [0, 0 - e],
+        
+        [core_radius + core_bump_radius, 0 - e],
+        [core_radius + core_bump_radius, 0],
+        [core_radius, core_bump_height],
+        [core_radius, total_height - core_bump_height],
+        [core_radius + core_bump_radius, total_height],
+        [core_radius + core_bump_radius, total_height + e],
+    ]);
+}
+
+module wheel() {
+    // deramp
+    // ramp
+    //   [tip]
+    // ramp
+    // mid
+    // ramp
+    //   [tip]
+    // ramp
+    // deramp
+
+    difference() {
+        rotate_extrude()
+        polygon([
+            [inner_radius, total_height],
+            [inner_radius, 0],
+            
+            [outer_radius + deramp_depth, 0],
+            [outer_radius + ramp_depth, deramp_height],
+            [outer_radius, deramp_height + ramp_height],
+            [outer_radius, deramp_height + ramp_height + mid],
+            [outer_radius + ramp_depth, deramp_height + ramp_height + mid + ramp_height],
+            [outer_radius + deramp_depth, total_height],
+        ]);
+        
+
+        for (b = [0 : bearing_count - 1]) {
+            translate([0, 0, deramp_height + ramp_height + (b * bearing_portion)])
+            translate([0, 0, bearing_portion / 2 - bearing_height / 2])
+            cylinder(h=bearing_height, r=bearing_radius);
+        }
+    }
+}
\ No newline at end of file
diff --git a/shot container lid.scad b/shot container lid.scad
new file mode 100644
index 0000000..5959026
--- /dev/null
+++ b/shot container lid.scad	
@@ -0,0 +1,37 @@
+$fn = 200;
+
+difference() {
+    union() {
+        rotate_extrude() {
+            translate([8, 1, 0])
+            circle(d=2);
+            
+            translate([44, 1, 0])
+            circle(d=2);
+            
+            translate([8, 0, 0])
+            square([36, 1]);
+        }
+
+        translate([0, 0, 10])
+        scale([1, 1, 0.7])
+        rotate_extrude() {
+            translate([9, 1, 0])
+            circle(d=4);
+
+            translate([43, 1, 0])
+            circle(d=4);
+        }
+
+        translate([0, 0, 1])
+        cylinder(h=10, d=90);
+    }
+    
+    cylinder(h=16, d=14);
+    
+    translate([0, 0, 2])
+    rotate_extrude() {
+        translate([11, 0, 0])
+        square([30, 16]);
+    }
+}
\ No newline at end of file
diff --git a/shot container.scad b/shot container.scad
new file mode 100644
index 0000000..f05c081
--- /dev/null
+++ b/shot container.scad	
@@ -0,0 +1,37 @@
+$fn = 400;
+
+difference() {
+    union() {
+        rotate_extrude() {
+            translate([4, 1, 0])
+            circle(d=2);
+
+            translate([40, 1, 0])
+            circle(d=2);
+
+            translate([4, 0, 0])
+            square([36, 1]);
+        }
+
+        translate([0, 0, 90.5])
+        scale([1, 1, 0.7])
+        rotate_extrude() {
+            translate([5, 1, 0])
+            circle(d=4);
+
+            translate([39, 1, 0])
+            circle(d=4);
+        }
+
+        translate([0, 0, 1])
+        cylinder(h=90, d=82);
+    }
+    
+    cylinder(h=92, d=6);
+
+    translate([0, 0, 5])
+    rotate_extrude() {
+        translate([7, 0, 0])
+        square([30, 92]);
+    }
+}
\ No newline at end of file