diff --git a/rods.scad b/rods.scad
new file mode 100644
index 0000000..c41a8fd
--- /dev/null
+++ b/rods.scad
@@ -0,0 +1,40 @@
+include <./common.scad>;
+
+LinearBearingOuterDiameter = 15;
+LinearBearingHeight = 24;
+LinearBearingBoreDiameter = 8;
+
+ThreadDiameter = 8;
+LinearMotionDiameter = 8;
+
+TNutDiameter1 = 22;
+TNutDiameter2 = 10.2;
+TNutInnerDiameter = 8;
+TNutHeight1 = 3.5;
+TNutHeight2 = 15;
+TNutOffset = 1.5;
+
+module linear_bearing (padD = 0, padH = 0) {
+	difference () {
+		cylinder(r = R(LinearBearingOuterDiameter + padD), h = LinearBearingHeight + padH, center = true, $fn = 100);
+		cylinder(r = R(LinearBearingBoreDiameter), h = LinearBearingHeight + padH + 1, center = true, $fn = 60);
+	}
+}
+
+module threaded_rod (H = 40, pad = 0) {
+	color("green") cylinder(r = R(ThreadDiameter + pad), h = H, center = true, $fn = 60);
+}
+
+module linear_motion_rod (H = 40, pad = 0) {
+	color("blue") cylinder(r = R(LinearMotionDiameter + pad), h = H, center = true, $fn = 60);
+}
+
+module T_nut (padD = 0, padH = 0) {
+	color("red") difference () {
+		union () {
+			translate([0, 0, -(TNutHeight2 / 2) + (TNutHeight1 / 2) + TNutOffset]) cylinder(r = R(TNutDiameter1 + padD), h = TNutHeight1, center = true, $fn = 100);
+			cylinder(r = R(TNutDiameter2), h = TNutHeight2 + padH, center = true, $fn = 80);
+		}
+		cylinder(r = R(TNutInnerDiameter), h = TNutHeight2 + 1, center = true, $fn = 60);
+	}
+}
\ No newline at end of file