# AI Assistant Instructions for 3D Print Meetup Repository

## Important Guidelines for AI Assistants

### Character Usage Rules

**NEVER use the unicode multiplication symbol (×) in any documentation.**

- ❌ WRONG: `25mm × 25mm × 25mm`
- ✅ CORRECT: `25mm x 25mm x 25mm`

**Always use lowercase 'x' for dimensions, not the unicode × (U+00D7) character.**

This applies to:

- Challenge documentation
- Wiki pages
- README files
- Any markdown documentation
- Announcements
- All text content

### Reason

The unicode × character can cause display issues in:

- Email clients
- Reddit posts
- Various text editors
- Screen readers
- Plain text environments

Using lowercase 'x' ensures universal compatibility across all platforms where this content will be shared.

### Quick Check

Before committing any files, search for the × character and replace with lowercase x.

PowerShell command to check:

```powershell
Get-ChildItem -Recurse -Include *.md | Select-String "×"
```

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**Last Updated**: October 28, 2025