FixKit AI

Home / Use case

Make 3D models and CAD parts from a description

โ€œI need a part, model or bracket designed but I don't know CAD.โ€

AI can write the code behind parametric CAD models or drive 3D tools from a description. A detailed spec gets far better results than one line.

Fix it yourself in 3 steps

  1. Write the spec: size, holes, thickness, material, and what it attaches to.
  2. Ask for a parametric model (code-based CAD) so you can tweak numbers later.
  3. Check measurements in a viewer before printing or ordering; print a cheap test first.

Copy this prompt

Design a parametric 3D model of [part]: dimensions [list], features [holes, fillets], material [type]. Expose the key measurements as variables at the top. Export a file I can open in a viewer. List any assumptions you made about dimensions. Stop before sending anything to a printer or manufacturer.

Fill in the [brackets]. Each prompt says when the AI should stop, so it doesn't wander off.

Agents people used for this: Claude, Claude Code, ChatGPT, Codex.

Inspired by real examples collected at agentusecases.ai.

๐Ÿ“š 6 real stories of people doing this with AI agents

Collected at AgentUseCases.ai.

Tools for this

#1 ยท Our pick

Claude Code

Best for: Serious work on real repos

Anthropic's agent for your terminal, IDE and desktop. Reads the whole repo, runs commands and tests, and handles large multi-file changes well.

Visit Claude Code โ†—
#2

Claude

Best for: Writing, analysis, code

Anthropic's assistant: strong writing, analysis and coding, with projects and artifacts for longer work.

Visit Claude โ†—
#3

OpenAI Codex

Best for: Delegating tasks as PRs

OpenAI's coding agent, in the CLI and in the cloud. Good at handing off well-scoped tasks that come back as pull requests.

Visit OpenAI Codex โ†—
#4

ChatGPT

Best for: Widest feature set

OpenAI's assistant with the broadest feature set: voice, images, search and a large app ecosystem.

Visit ChatGPT โ†—