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DrawPad MCP

DrawPad MCP

DrawPad MCP

This repository is where DrawPad MCP is released and supported: DrawPad.mcpb for Claude Desktop is on the Releases page, and bugs and requests go in Issues. All of Opticell's free tools for Claude: opticell-mcp.

Let Claude design things you can 3D-print. Ask for "a keychain that says LUNA", "a 60 mm star cookie cutter" or "a plant label for basil". Claude builds it with the engine from DrawPad Pro.stl, shows you a preview, and saves a watertight STL for your slicer plus a DrawPad project you can keep editing on iPad.

macOS (Apple silicon and Intel).

Install

Claude Desktop: download DrawPad.mcpb from https://www.opticell-limited.com/drawpad and double-click it.

Claude Code

claude mcp add drawpad -- npx -y @opticell/drawpad-mcp mcp

Any other MCP client: run npx -y @opticell/drawpad-mcp mcp as a stdio server.

Related MCP server: Jarvis Onshape MCP

What Claude can do

  • Templates: keychain, cookie cutter (heart, star, circle, flower, cloud or any outline), name sign, coaster, gift tag, stencil.

  • Custom designs: circles, rectangles, polygons, stars, hearts and text, with holes, stacked layers and thin walls, all in millimetres.

  • Check an STL: size, volume, filament weight, and whether it's watertight.

Every design reports its size, volume and grams of PLA/PETG, and comes with a rendered preview. Files go to ~/Documents/DrawPad Designs.

Open designs in DrawPad Pro.stl

AirDrop the .lsproj file to your iPad or iPhone, or save it to iCloud Drive, and open it. DrawPad imports it as a new project, and templates stay editable.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

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    • A
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      Enables Claude to create 3D-printable CAD models using build123d, with tools for modeling, modification, analysis, and publishing to platforms like Thingiverse and GitHub.
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      Enables Claude to create and modify real Onshape CAD models — sketches, extrudes, fillets, patterns, mates, and parametric variables — with every mutation returning structured status, warnings, and geometric deltas. Includes multi-view PNG rendering, image-reference decomposition, and drawing OCR so the agent can visually verify and iterate on parts and assemblies.
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    • F
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