# Cylinder Words

> Rotating headline word printed around a real 3D drum that clicks forward one face at a time with a slot-reel overshoot. Neighbouring faces curve away above and below, the inline width locks to the longest word, hover pauses it, and the current word is announced to screen readers.

- Slug: `cylinder-words`
- Category: [Text effects](https://www.assembli.design/category/text-effects.md)
- Type: component
- Tags: 3d, rotating-words, headline, drum, css-3d
- npm dependencies: motion
- shadcn/ui dependencies: none
- Added: 2026-10-15
- Live preview: https://www.assembli.design/preview/cylinder-words
- Page: https://www.assembli.design/components/cylinder-words

## Install

One-time setup (needs a subscription):

1. Add the registry to the project's `components.json`: `{"@assembli":{"url":"https://www.assembli.design/r/{name}.json","headers":{"Authorization":"Bearer ${ASSEMBLI_API_KEY}"}}}` (merge into `"registries"`).
2. Put an API key from https://www.assembli.design/account in `.env.local` as `ASSEMBLI_API_KEY=asm_…`.

Then install with the shadcn CLI (writes `components/cylinder-words/cylinder-words.tsx` and installs dependencies):

```bash
npx shadcn@latest add @assembli/cylinder-words
```

Registry item JSON: https://www.assembli.design/r/cylinder-words.json (send `Authorization: Bearer <api key>`)

## Code

> Component source needs an Assembli subscription ($12/month) and an API key sent as `Authorization: Bearer <key>`. To get one without copying anything, POST https://www.assembli.design/api/agent/login (or call the MCP tool connect_account), show the user the link it returns, and poll https://www.assembli.design/api/agent/token for the key. Or subscribe at https://www.assembli.design/pricing and create a key at https://www.assembli.design/account.