diff --git a/models/dowel-holder.js b/models/dowel-holder.js
new file mode 100644
index 0000000..89d77ab
--- /dev/null
+++ b/models/dowel-holder.js
@@ -0,0 +1,108 @@
+/** @import * as Replicad from 'replicad' */
+
+export const defaultParams = {
+  gridSpacingInMm: 40,
+  dowelDiameterInMm: 22,
+  fastenerHoleDiameterInMm: 8,
+  fastenerCapDiameterInMm: 13,
+  holderThicknessInMm: 10,
+  holderOffsetIsUp: true,
+  bottomThicknessInMm: 1,
+  edgeThicknessInMm: 2,
+}
+
+/**
+ * @param {typeof defaultParams} params
+ */
+export default function main(params) {
+  const { draw, drawCircle } = replicad
+  const {
+    gridSpacingInMm,
+    dowelDiameterInMm,
+    fastenerHoleDiameterInMm,
+    fastenerCapDiameterInMm,
+    holderThicknessInMm,
+    holderOffsetIsUp,
+    bottomThicknessInMm,
+    edgeThicknessInMm,
+  } = params
+
+  const holder = createHolder()
+  const bottom = createBottom()
+
+  return holder.fuse(bottom)
+
+  function createBottom() {
+    let bottomProfile = draw()
+      .movePointerTo([
+        -(1 / 2) * gridSpacingInMm,
+        (1 / 2) * fastenerCapDiameterInMm + edgeThicknessInMm,
+      ])
+      .halfEllipseTo(
+        [-(1 / 2) * gridSpacingInMm, -(1 / 2) * fastenerCapDiameterInMm - edgeThicknessInMm],
+        (1 / 2) * fastenerCapDiameterInMm + edgeThicknessInMm,
+        true,
+      )
+      .hLineTo((1 / 2) * gridSpacingInMm)
+      .halfEllipseTo(
+        [(1 / 2) * gridSpacingInMm, (1 / 2) * fastenerCapDiameterInMm + edgeThicknessInMm],
+        (1 / 2) * fastenerCapDiameterInMm + edgeThicknessInMm,
+        true,
+      )
+      .close()
+
+    bottomProfile = bottomProfile
+      .cut(drawCircle((1 / 2) * fastenerHoleDiameterInMm).translate([(1 / 2) * gridSpacingInMm, 0]))
+      .cut(
+        drawCircle((1 / 2) * fastenerHoleDiameterInMm).translate([-(1 / 2) * gridSpacingInMm, 0]),
+      )
+
+    return bottomProfile.sketchOnPlane().extrude(bottomThicknessInMm)
+  }
+
+  function createHolder() {
+    const topAngleInDeg = 30
+
+    const innerRadius = (1 / 2) * dowelDiameterInMm
+    const outerRadius = innerRadius + edgeThicknessInMm
+
+    const topInnerX = innerRadius * Math.cos(degToRad(topAngleInDeg))
+    const topOuterX = topInnerX + edgeThicknessInMm
+    const topY = innerRadius * Math.sin(degToRad(topAngleInDeg))
+
+    const holderProfile = draw()
+      .movePointerTo([0, -innerRadius])
+      .ellipseTo([topInnerX, topY], innerRadius, innerRadius, 0, false, true)
+      .lineTo([topOuterX, topY])
+      .ellipseTo([-topOuterX, topY], outerRadius, outerRadius, 0, true, false)
+      .lineTo([-topInnerX, topY])
+      .ellipseTo([0, -innerRadius], innerRadius, innerRadius, 0, false, true)
+      .close()
+
+    return holderProfile.sketchOnPlane().extrude(holderThicknessInMm + bottomThicknessInMm)
+
+    /*
+    // if need to offset to make space for fastener cap
+    if (outerRadius > ((1 / 2) * gridSpacingInMm - (1 / 2) * fastenerCapDiameterInMm)) {
+    const direction = holderOffsetIsUp ? 1 : -1
+
+    const offset =
+      holderProfile = holderProfile.translate([0,
+    }
+    */
+  }
+}
+
+/**
+ * @param {number} degrees
+ */
+function degToRad(degrees) {
+  return 2 * Math.PI * (degrees / 360)
+}
+
+/**
+ * @param {number} radians
+ */
+function radToDeg(radians) {
+  return 360 * (radians / (2 * Math.PI))
+}