diff --git a/client/public/locales/en/common.json b/client/public/locales/en/common.json
index 1931964..09db15b 100644
--- a/client/public/locales/en/common.json
+++ b/client/public/locales/en/common.json
@@ -263,7 +263,8 @@
             "import_external_description": "Select a filament in the list to automatically populate its details in the filament creation form. This will overwrite any data you have entered in the form.<br><br>A Manufacturer object will be created automatically when you click Ok, if necessary.",
             "created_success": "Created filament \"{{name}}\"",
             "vendor_placeholder": "Select a manufacturer",
-            "name_placeholder": "E.g. Matte Black"
+            "name_placeholder": "E.g. Matte Black",
+            "material_placeholder": "PLA, PETG, ABS, etc."
         },
         "buttons": {
             "add_spool": "Add Spool"
diff --git a/client/src/components/filamentCreateModal.tsx b/client/src/components/filamentCreateModal.tsx
index 1e763ba..1d92f8e 100644
--- a/client/src/components/filamentCreateModal.tsx
+++ b/client/src/components/filamentCreateModal.tsx
@@ -1,11 +1,17 @@
 import { useSelect } from "@refinedev/antd";
 import { useInvalidate, useTranslate } from "@refinedev/core";
-import { Button, ColorPicker, Divider, Form, Input, InputNumber, Modal, Select, message } from "antd";
+import { AutoComplete, Button, ColorPicker, Divider, Form, Input, InputNumber, Modal, Select, message } from "antd";
 import { PlusOutlined } from "@ant-design/icons";
-import { useState } from "react";
+import { useMemo, useState } from "react";
 import { Color } from "antd/es/color-picker";
 import { IFilament } from "../pages/filaments/model";
 import { IVendor } from "../pages/vendors/model";
+import {
+  DEFAULT_DENSITY,
+  DEFAULT_DIAMETER,
+  getDensityForMaterial,
+  KNOWN_MATERIALS,
+} from "../utils/materialDefaults";
 import { getAPIURL } from "../utils/url";
 import { VendorCreateModal } from "./vendorCreateModal";
 
@@ -15,10 +21,6 @@ export interface FilamentCreateModalProps {
   onClose: () => void;
 }
 
-// Default values for common filament properties
-const DEFAULT_DIAMETER = 1.75;
-const DEFAULT_DENSITY = 1.24; // PLA
-
 /**
  * Modal for quickly creating a filament inline without navigating away from the current page.
  * Includes essential fields and the ability to create a vendor inline.
@@ -29,6 +31,23 @@ export function FilamentCreateModal(props: FilamentCreateModalProps) {
   const invalidate = useInvalidate();
   const [isSubmitting, setIsSubmitting] = useState(false);
   const [isVendorModalOpen, setIsVendorModalOpen] = useState(false);
+  const [materialSearch, setMaterialSearch] = useState("");
+
+  // Material options for AutoComplete
+  const materialOptions = useMemo(() => {
+    const filtered = materialSearch
+      ? KNOWN_MATERIALS.filter((m) => m.toLowerCase().includes(materialSearch.toLowerCase()))
+      : KNOWN_MATERIALS;
+    return filtered.map((material) => ({ value: material, label: material }));
+  }, [materialSearch]);
+
+  // Auto-fill density when material is selected or entered
+  const handleMaterialChange = (value: string) => {
+    const density = getDensityForMaterial(value);
+    if (density !== undefined) {
+      form.setFieldValue("density", density);
+    }
+  };
 
   // Vendor select
   const { selectProps: vendorSelectProps } = useSelect<IVendor>({
@@ -171,7 +190,14 @@ export function FilamentCreateModal(props: FilamentCreateModalProps) {
             label={t("filament.fields.material")}
             name="material"
           >
-            <Input maxLength={64} placeholder="PLA, PETG, ABS, etc." />
+            <AutoComplete
+              options={materialOptions}
+              onSearch={setMaterialSearch}
+              onSelect={handleMaterialChange}
+              onBlur={(e) => handleMaterialChange((e.target as HTMLInputElement).value)}
+              placeholder={t("filament.form.material_placeholder")}
+              maxLength={64}
+            />
           </Form.Item>
 
           <Form.Item
diff --git a/client/src/pages/filaments/create.tsx b/client/src/pages/filaments/create.tsx
index 83f9e98..47b0c5e 100644
--- a/client/src/pages/filaments/create.tsx
+++ b/client/src/pages/filaments/create.tsx
@@ -1,15 +1,21 @@
 import { Create, useForm, useSelect } from "@refinedev/antd";
 import { HttpError, IResourceComponentsProps, useInvalidate, useTranslate } from "@refinedev/core";
-import { Button, ColorPicker, Divider, Form, Input, InputNumber, Radio, Select, Typography } from "antd";
+import { AutoComplete, Button, ColorPicker, Divider, Form, Input, InputNumber, Radio, Select, Typography } from "antd";
 import { PlusOutlined } from "@ant-design/icons";
 import TextArea from "antd/es/input/TextArea";
 import dayjs from "dayjs";
 import utc from "dayjs/plugin/utc";
-import { useEffect, useState } from "react";
+import { useEffect, useMemo, useState } from "react";
 import { ExtraFieldFormItem, ParsedExtras, StringifiedExtras } from "../../components/extraFields";
 import { FilamentImportModal } from "../../components/filamentImportModal";
 import { VendorCreateModal } from "../../components/vendorCreateModal";
 import { MultiColorPicker } from "../../components/multiColorPicker";
+import {
+  DEFAULT_DENSITY,
+  DEFAULT_DIAMETER,
+  getDensityForMaterial,
+  KNOWN_MATERIALS,
+} from "../../utils/materialDefaults";
 import { formatNumberOnUserInput, numberParser, numberParserAllowEmpty } from "../../utils/parsing";
 import { ExternalFilament } from "../../utils/queryExternalDB";
 import { EntityType, useGetFields } from "../../utils/queryFields";
@@ -36,6 +42,15 @@ export const FilamentCreate: React.FC<IResourceComponentsProps & CreateOrClonePr
   const [isVendorModalOpen, setIsVendorModalOpen] = useState(false);
   const invalidate = useInvalidate();
   const [colorType, setColorType] = useState<"single" | "multi">("single");
+  const [materialSearch, setMaterialSearch] = useState("");
+
+  // Material options for AutoComplete
+  const materialOptions = useMemo(() => {
+    const filtered = materialSearch
+      ? KNOWN_MATERIALS.filter((m) => m.toLowerCase().includes(materialSearch.toLowerCase()))
+      : KNOWN_MATERIALS;
+    return filtered.map((material) => ({ value: material, label: material }));
+  }, [materialSearch]);
 
   const { form, formProps, formLoading, onFinish, redirect } = useForm<
     IFilament,
@@ -56,6 +71,10 @@ export const FilamentCreate: React.FC<IResourceComponentsProps & CreateOrClonePr
 
     // Parse the extra fields from string values into real types
     formProps.initialValues = ParsedExtras(formProps.initialValues);
+  } else {
+    // Set defaults for new filaments
+    formProps.initialValues.density = formProps.initialValues.density ?? DEFAULT_DENSITY;
+    formProps.initialValues.diameter = formProps.initialValues.diameter ?? DEFAULT_DIAMETER;
   }
 
   const handleSubmit = async (redirectTo: "list" | "create") => {
@@ -79,6 +98,14 @@ export const FilamentCreate: React.FC<IResourceComponentsProps & CreateOrClonePr
     setIsVendorModalOpen(false);
   };
 
+  // Auto-fill density when material is selected or entered
+  const handleMaterialChange = (value: string) => {
+    const density = getDensityForMaterial(value);
+    if (density !== undefined) {
+      form.setFieldValue("density", density);
+    }
+  };
+
   const importFilament = async (filament: ExternalFilament) => {
     const vendor = await getOrCreateVendorFromExternal(filament.manufacturer);
     await invalidate({
@@ -265,7 +292,14 @@ export const FilamentCreate: React.FC<IResourceComponentsProps & CreateOrClonePr
             },
           ]}
         >
-          <Input maxLength={64} />
+          <AutoComplete
+            options={materialOptions}
+            onSearch={setMaterialSearch}
+            onSelect={handleMaterialChange}
+            onBlur={(e) => handleMaterialChange((e.target as HTMLInputElement).value)}
+            placeholder={t("filament.form.material_placeholder")}
+            maxLength={64}
+          />
         </Form.Item>
         <Form.Item
           label={t("filament.fields.price")}
diff --git a/client/src/utils/materialDefaults.ts b/client/src/utils/materialDefaults.ts
new file mode 100644
index 0000000..c84032f
--- /dev/null
+++ b/client/src/utils/materialDefaults.ts
@@ -0,0 +1,90 @@
+/**
+ * Standard material densities for common 3D printing filaments.
+ * Values are in g/cm³.
+ *
+ * Reference: https://www.simplify3d.com/resources/materials-guide/
+ */
+export const MATERIAL_DENSITY_MAP: Record<string, number> = {
+  PLA: 1.24,
+  ABS: 1.04,
+  PETG: 1.27,
+  NYLON: 1.52,
+  TPU: 1.21,
+  PC: 1.3,
+  WOOD: 1.28,
+  CF: 1.3,
+  "PC/ABS": 1.19,
+  HIPS: 1.03,
+  PVA: 1.23,
+  ASA: 1.05,
+  PP: 0.9,
+  POM: 1.4,
+  PMMA: 1.18,
+  FPE: 2.16,
+};
+
+/**
+ * Default filament diameter in mm (most common standard).
+ */
+export const DEFAULT_DIAMETER = 1.75;
+
+/**
+ * Default density in g/cm³ (PLA, most common material).
+ */
+export const DEFAULT_DENSITY = 1.24;
+
+/**
+ * List of known materials for AutoComplete suggestions.
+ */
+export const KNOWN_MATERIALS = Object.keys(MATERIAL_DENSITY_MAP);
+
+/**
+ * Get the density for a material type using fuzzy matching.
+ * Handles variations like "PLA Silk", "PETG-CF", "Wood PLA", etc.
+ *
+ * @param material - The material string to look up
+ * @returns The density if a match is found, undefined otherwise
+ */
+export function getDensityForMaterial(material: string | undefined): number | undefined {
+  if (!material) return undefined;
+
+  const normalizedInput = material.toUpperCase().trim();
+
+  // Exact match first
+  if (MATERIAL_DENSITY_MAP[normalizedInput]) {
+    return MATERIAL_DENSITY_MAP[normalizedInput];
+  }
+
+  // Fuzzy match: check if input starts with or contains a known material
+  // Sort by length descending to match longer patterns first (e.g., "PC/ABS" before "PC")
+  const sortedMaterials = KNOWN_MATERIALS.sort((a, b) => b.length - a.length);
+
+  for (const knownMaterial of sortedMaterials) {
+    // Check if the input starts with the material (e.g., "PLA Silk" starts with "PLA")
+    if (normalizedInput.startsWith(knownMaterial)) {
+      return MATERIAL_DENSITY_MAP[knownMaterial];
+    }
+    // Check if the input contains the material as a word boundary
+    // This handles cases like "Wood PLA" or "CF-PETG"
+    const regex = new RegExp(`\\b${knownMaterial}\\b`, "i");
+    if (regex.test(normalizedInput)) {
+      return MATERIAL_DENSITY_MAP[knownMaterial];
+    }
+  }
+
+  return undefined;
+}
+
+/**
+ * Filter materials for AutoComplete based on input.
+ * Returns materials that contain the search string (case-insensitive).
+ *
+ * @param searchValue - The search string
+ * @returns Filtered list of material suggestions
+ */
+export function filterMaterials(searchValue: string): string[] {
+  if (!searchValue) return KNOWN_MATERIALS;
+
+  const normalizedSearch = searchValue.toUpperCase().trim();
+  return KNOWN_MATERIALS.filter((material) => material.includes(normalizedSearch));
+}