Initial 3D print farm structure and documentation

- Printer profiles folder structure
- Production-ready file organization
- Getting started guide
- Shopping list for spare parts
- README with workflow

README.md

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+# Fred's 3D Print Farm
+
+**3D printing business configs, printer profiles, and production-ready files**
+
+## What's Here
+
+- **printer-profiles/** - Slicer profiles and printer configs (PrusaSlicer, Bambu Studio, Cura)
+- **production-ready/** - Tested and approved 3MF/STL files ready for printing
+- **designs/** - Work-in-progress designs and customer orders
+- **docs/** - Documentation, workflow guides, and business info
+
+## Printers
+
+- **Bambu Lab A1** - Primary printer
+  - Needs: Spare hotends, feed tubes (see shopping list)
+
+## Workflow
+
+1. **Design** - Fusion 360, Blender, or AI-generated
+2. **Slice** - Bambu Studio or PrusaSlicer
+3. **Test** - Print sample, verify quality
+4. **Production** - Move to `production-ready/`
+5. **Track** - Update inventory and orders
+
+## File Organization
+
+```
+production-ready/
+  widget-v2.3mf           (latest version)
+  bracket-final.3mf       (approved for production)
+  custom-part-tested.stl  (customer order ready)
+
+printer-profiles/
+  bambu-a1-pla.json       (PLA profile)
+  bambu-a1-petg.json      (PETG profile)
+```
+
+## Notes
+
+- Store only TESTED files in `production-ready/`
+- Keep design iterations in `designs/work-in-progress/`
+- Document settings and lessons learned in `docs/`
+
+---
+
+*Business collaboration: Fred + Son*