diff --git a/shaker_plate.stl b/shaker_plate.stl
new file mode 100644
index 0000000..f81ceec
Binary files /dev/null and b/shaker_plate.stl differ
diff --git a/src/shaker_plate.ipynb b/src/shaker_plate.ipynb
new file mode 100644
index 0000000..d16e5ac
--- /dev/null
+++ b/src/shaker_plate.ipynb
@@ -0,0 +1,89 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "%matplotlib inline"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import math\n",
+    "\n",
+    "import numpy as np\n",
+    "import matplotlib.pyplot as plt"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "fig, ax = plt.subplots()\n",
+    "plt.xlim(-5, 150)\n",
+    "plt.ylim(-5, 150)\n",
+    "ax.set_aspect(1)\n",
+    "\n",
+    "cx, cy, r1, r2, r3, rh, rp = 72.5, 72.5, 72.5, 63.5, 50.0, 6.0, 4.5\n",
+    "\n",
+    "ax.add_artist(plt.Circle((cx, cy), r1, color='red'))\n",
+    "print('tube coords (lower left)')\n",
+    "for angle in np.arange(0, math.pi*2, math.pi/12):\n",
+    "    x = (r2 * math.cos(angle)) + cx\n",
+    "    y = (r2 * math.sin(angle)) + cy\n",
+    "    print(round(x - rh, 1), round(y - rh, 1))\n",
+    "    ax.add_artist(plt.Circle((x, y), rh, color='black'))\n",
+    "print('###')\n",
+    "print('post coords (lower left)')\n",
+    "for angle in np.arange(0, math.pi*2, math.pi*2/3):\n",
+    "    x = (r3 * math.cos(angle)) + cx\n",
+    "    y = (r3 * math.sin(angle)) + cy\n",
+    "    print(round(x - rh, 1), round(y - rh, 1))\n",
+    "    ax.add_artist(plt.Circle((x, y), rh, color='white'))\n",
+    "print('###')\n",
+    "print('post-hole coords (lower left)')\n",
+    "for angle in np.arange(0, math.pi*2, math.pi/3):\n",
+    "    x = (r3 * math.cos(angle)) + cx\n",
+    "    y = (r3 * math.sin(angle)) + cy\n",
+    "    print(round(x - rp, 1), round(y - rp, 1))\n",
+    "    ax.add_artist(plt.Circle((x, y), rp, color='black'))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.6.7"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}