MoldSim MCP Server

io.github.kobzevvvPublished by GitHub account kobzevvvv0.4.1Updated Oct 24, 2026

Injection molding simulation expertise — materials, process validation, and DFM checks

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Overview

AI-generated overview

A local MCP server that gives an AI assistant injection molding expertise: material properties, process validation, DFM checks and simulation specs.

What you can do
Answer free-text questions on defects, DFM rules, mesh strategies and process optimization from a knowledge base of 21 materials and common molding defects and simulation topics (query_simulation_knowledge). Look up material data such as Cross-WLF viscosity, Tait PVT, thermal, mechanical and processing-window values (get_material_properties). Check melt and mold temperatures and other process parameters against a material's processing window, with errors, warnings and suggestions (validate_process_parameters). Turn a natural-language part description into a structured simulation specification with analysis sequence, mesh recommendation and process conditions (generate_simulation_spec). Build
When to use it
Useful when working on injection molding design or simulation and you want an assistant to supply material data, sanity-check process settings, draft a simulation spec, or run DFM checks without looking values up by hand. It is software-agnostic guidance, not a replacement for running Moldflow, Moldex3D or similar solvers.
Requirements
Runs locally over stdio, typically started with npx from the npm package moldsim-mcp, so Node.js is needed. No accounts, API keys, environment variables or headers are declared. The README mentions a local embedded vector database and HuggingFace embeddings, which may download model files on first use.
Before you install
All tools are read-only lookups and checks; nothing is written, sent or deleted. Material data and DFM ratings are reference guidance and should be verified against supplier datasheets and your own simulation before production decisions. The README does not state where the knowledge base comes from or how current it is.

Installation

In SourceWeft

  1. Open MoldSim MCP Server in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

MoldSim MCP Server

[MIT License] [npm] [MCP]

Give your AI assistant injection molding expertise.

An MCP (Model Context Protocol) server that gives AI assistants expert knowledge about injection molding simulation. Material properties, process validation, troubleshooting, and simulation specification generation — all available as tools.

Website: moldsim.com

Why

Setting up injection molding simulations (Moldflow, Moldex3D, Cadmould) requires deep knowledge: Cross-WLF viscosity models, Tait PVT data, processing windows, mesh strategies, DFM rules. This MCP server makes that knowledge available to any AI assistant that supports MCP.

Quick Start

Claude Code (recommended)

bash
claude mcp add moldsim -- npx -y moldsim-mcp

That's it. Ask Claude about injection molding — it will automatically use MoldSim tools.

bash
claude "What causes warpage in glass-filled nylon parts?"claude "Give me the Cross-WLF parameters for PC/ABS"claude "Validate: ABS at 245C melt, 60C mold, 2.5mm wall"

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%/Claude/claude_desktop_config.json (Windows):

json
{  "mcpServers": {    "moldsim": {      "command": "npx",      "args": ["-y", "moldsim-mcp"]    }  }}

From source

bash
git clone https://github.com/kobzevvv/moldsim-mcp.gitcd moldsim-mcpnpm installnpm run build

Then point your MCP client to node dist/index.js.

Tools

query_simulation_knowledge

Free-text Q&A against the knowledge base. Ask about defects, DFM rules, mesh strategies, process optimization.

"Why is my part warping?" → causes, solutions, simulation checks"What mesh type should I use?" → midplane vs dual-domain vs 3D guidance"How to reduce cycle time?" → cooling optimization strategies

get_material_properties

Material property lookup. Returns Cross-WLF viscosity, Tait PVT, thermal, processing window, and mechanical data.

21 materials included: ABS, PP Homo, PP Copo, PA6, PA66, PA66-GF30, PC, PC/ABS, POM, HDPE, LDPE, PMMA, PBT, PBT-GF30, PET, PS, HIPS, TPU, SAN, ASA, PPE/PS

"PA66-GF30" → Cross-WLF coefficients, Tait PVT, processing window 275-310°C, fiber effects"PC" → all properties or filter by group (viscosity, thermal, processing)

validate_process_parameters

Checks your process parameters against the material's processing window. Flags errors, warnings, and provides suggestions.

material: "ABS", melt_temp_C: 280 → ERROR: exceeds max 260°C, risk of degradationmaterial: "PA66", mold_temp_C: 40 → WARNING: below min 70°C, poor crystallization

generate_simulation_spec

Natural language → structured simulation specification. Describe the part and get back analysis types, mesh recommendations, process conditions, and expected outputs.

"Automotive dashboard panel in PC/ABS, 2.5mm wall, warpage analysis"→ Fill+Pack+Cool+Warp sequence, dual-domain mesh, process conditions, expected outputs

compare_materials

Side-by-side comparison of 2-4 materials. Processing windows, thermal properties, mechanical data, and auto-generated key differences.

["abs-generic", "pc", "pa66-gf30"] → comparison table with stiffness, shrinkage, heat resistance diffs

generate_dfm_checklist

Design for Manufacturability checklist with pass/warn/fail ratings. Input part parameters and get 15+ DFM rule checks.

material: "ABS", wall: 2mm, rib: 1.5mm, draft: 0.5°→ 16 checks: wall OK, rib WARN (75% ratio), draft WARN (below 1°), sink risk, venting...

Examples

Ask your AI assistant:

  • "What are the Cross-WLF parameters for PA66-GF30?"
  • "I'm getting sink marks on my PC housing — what should I check?"
  • "Validate my process: ABS at 250°C melt, 70°C mold, 2mm wall"
  • "Generate a simulation spec for a PP container with 1.5mm walls"
  • "Compare ABS vs PC vs PA66-GF30 for an automotive connector"
  • "Run a DFM check: 2mm wall, 1.5mm ribs, 0.5° draft in PC"
  • "What mesh type should I use for a thick-walled POM gear (5mm)?"
  • "How do I fix warpage in a glass-filled PA66 connector?"

Knowledge Coverage

AreaCoverage
Materials21 grades with Cross-WLF, Tait PVT, thermal, mechanical, processing + comparison
DefectsShort shot, flash, sink marks, warpage, weld lines, burn marks, jetting, splay, voids, flow marks
SimulationMesh sensitivity, race tracking, cooling, overpacking, shear rate
ProcessCycle time, gate location, V/P switchover, degradation, crystallization, fiber orientation
DFMWall thickness, ribs, draft, radii, bosses, gating, tolerances, shrinkage, venting
MeshingMidplane, dual-domain, 3D — when to use, element sizing, quality metrics

Compatible Software

MoldSim MCP provides software-agnostic knowledge that applies to all major injection molding simulation packages:

  • Autodesk Moldflow — Adviser & Insight
  • Moldex3D — all editions
  • CADMOULD — Simcon
  • SIGMASOFT — Virtual Molding
  • SolidWorks Plastics

Tech Stack

  • Runtime: Node.js, TypeScript
  • Search: Qdrant vector database (local, embedded)
  • Embeddings: HuggingFace transformers
  • Protocol: Model Context Protocol (MCP)

License

MIT

Source: README.md at commit ee4f5c1

Tools

0
SourceWeft has not started this package in its sandbox yet, so its tools are not known.

Version history

1
  1. v0.4.1LatestSep 16, 2026

Score

50% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 days25 pts

    Keep the endpoint answering the MCP handshake; SourceWeft probes it every 30 days.

  • Auth declared10 pts

    Declare the credential headers in the registry entry, or keep the endpoint answering the probe so its auth can be classified.

  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts