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+# ExportDXF: Remove API, Export to Excel
+
+**Date:** 2026-04-13
+**Status:** Draft
+
+## Goal
+
+Remove the FabWorks API and database dependencies from ExportDXF. Replace with local file output: DXF files + an Excel workbook (BOM + Cut Templates) that downstream tools like OpenNest can import directly. Make the tool self-contained — no server setup required.
+
+## Approach
+
+Merge the `feature/fabworks-api` branch into `master` to get its structural improvements (service layer, models, content hashing, EtchBendLines fixes), then remove the API/DB layer and replace with Excel + log file output.
+
+---
+
+## Output Structure
+
+### Output Folder
+
+- Default location: `Templates/` folder in the same directory as the source SolidWorks file
+- If `Templates/` already exists, the export writes into it (see Revision Handling below)
+
+### Files Produced
+
+```
+C:\Projects\4321\
+├── 4321 A01.SLDDRW              (source drawing)
+└── Templates\
+    ├── 4321 A01 PT01.dxf
+    ├── 4321 A01 PT02.dxf
+    ├── 4321 A01 PT03.dxf
+    ├── 4321 A01 PT03 Rev2.dxf   (revised file, original kept)
+    ├── 4321 A01.xlsx
+    └── 4321 A01.log
+```
+
+### Excel Workbook
+
+Written with **ClosedXML 0.104.2** (same version as OpenNest).
+
+**"BOM" sheet** — exact copy of the SolidWorks BOM table. All visible columns and rows reproduced as-is. Only present when exporting from a Drawing that contains a BOM table. Part and Assembly exports omit this sheet.
+
+**"Cut Templates" sheet** — one row per sheet metal part:
+
+| Column | Description |
+|--------|-------------|
+| Item # | Item number from the BOM or export sequence |
+| File Name | DXF filename stem (no path, no extension) |
+| Revision | Revision number (1 for initial, increments on change) |
+| Thickness | Sheet metal thickness |
+| K-Factor | K-Factor value |
+| Bend Radius | Default bend radius |
+| Content Hash | SHA256 of DXF content (excluding HEADER section) |
+
+Present for all export types (Part, Assembly, Drawing).
+
+### Log Files
+
+**Per-export log:** `Templates/{prefix}.log`
+- Timestamped lines: `2026-04-13 14:32:05 [INFO] Exported 4321 A01 PT03.dxf`
+- Levels: INFO, WARNING, ERROR
+- Appends on re-export
+
+**App-level log:** `C:\ExportDXF\ExportDXF.log`
+- Rolling log capturing all exports across all drawings
+- Same format as per-export log
+
+---
+
+## Filename Format Template
+
+### User Interface
+
+A single text box replaces the equipment/drawing dropdowns. The user types a format string that controls DXF and xlsx naming.
+
+**Example:** `4321 A01 PT{item_no:2}`
+
+### Supported Placeholders
+
+| Placeholder | Description | Example Output |
+|-------------|-------------|----------------|
+| `{item_no:N}` | Item number, zero-padded to N digits | `{item_no:2}` → `03` |
+| `{part_name}` | SolidWorks part name | `Bracket` |
+| `{config}` | Configuration name | `Default` |
+| `{material}` | Material name | `AISI 304` |
+
+### Naming Rules
+
+- DXF filename: full template evaluated per part → `4321 A01 PT03.dxf`
+- Excel filename: literal text before the first placeholder → `4321 A01.xlsx`
+- Log filename: same stem as excel → `4321 A01.log`
+- Validation: template must contain `{item_no}` (or `{item_no:N}`) to avoid filename collisions
+- If the template starts with a placeholder (no literal prefix), fall back to the document name for the xlsx/log filename
+
+### Auto-Fill
+
+On document open, the format template text box is auto-filled via `IDrawingInfoExtractor`.
+
+---
+
+## Drawing Info Extraction
+
+### Interface
+
+```csharp
+public interface IDrawingInfoExtractor
+{
+    bool TryExtract(string documentName, out DrawingInfo info);
+}
+
+public class DrawingInfo
+{
+    public string EquipmentNumber { get; set; }
+    public string DrawingNumber { get; set; }
+    public string DefaultTemplate { get; set; }
+}
+```
+
+### Implementations
+
+**`DefaultDrawingInfoExtractor`** — uses the document name as literal prefix, appends the default suffix from app.config (`DefaultSuffix` setting, default `PT{item_no:2}`).
+
+Example: document `MyPart.SLDPRT` → template `MyPart {item_no:2}` (or with configured suffix)
+
+**`EquipmentDrawingInfoExtractor`** — parses the `{EquipmentNo} {DrawingNo}` pattern from document names in AJ's workplace format. Builds template like `4321 A01 PT{item_no:2}`.
+
+### Resolution
+
+Extractors are tried in order. First one that returns `true` wins. Falls back to `DefaultDrawingInfoExtractor`.
+
+---
+
+## Revision Handling
+
+When re-exporting to an existing `Templates` folder:
+
+1. Read the existing xlsx Cut Templates sheet (if present)
+2. For each part being exported, compute the DXF content hash
+3. **Hash matches existing row** → skip, leave existing DXF file untouched
+4. **Hash differs from existing row** → write new DXF with revision suffix (e.g., `PT03 Rev2.dxf`), update the xlsx row with new filename, new hash, incremented revision number
+5. **New part (no existing row)** → write DXF, add new row to xlsx with revision 1
+6. Old revision DXF files are kept in the folder as history
+
+The BOM sheet (if present) is fully rewritten from the current drawing's BOM table on each export.
+
+---
+
+## What We Keep from feature/fabworks-api
+
+- Service layer architecture: `DxfExportService`, `IPartExporter`, `IDrawingExporter`, `IBomExtractor`
+- Models: `BomItem`, `CutTemplate`, `Item`, `ExportContext`, `LogEvent`
+- `ContentHasher` utility (SHA256 excluding DXF HEADER section)
+- All 9 EtchBendLines submodule fixes (ACadSharp migration, bend detection, degree symbol, etc.)
+- Async export flow with cancellation
+- View flip decider
+- SolidWorks user input disabling during export
+
+## What We Remove
+
+- `FabWorksApiClient` and all API DTOs
+- `ExportDxfDbContext`, EF Core migrations, SQL Server connection string
+- NuGet packages: `Microsoft.EntityFrameworkCore.SqlServer`, `Microsoft.EntityFrameworkCore.Tools`
+- Equipment/Drawing dropdowns from MainForm
+- Any FabWorks.Core / FabWorks.Api projects (if present after merge)
+
+## What We Add
+
+- `IDrawingInfoExtractor` interface + two implementations
+- Format template text box with placeholder parsing
+- `ExcelExportService` using ClosedXML — reads/writes BOM + Cut Templates sheets
+- `LogFileService` — per-export and app-level log writing
+- Output folder logic (Templates folder next to source, revision handling)
+- NuGet package: `ClosedXML 0.104.2`
+- `DefaultSuffix` setting in app.config
+
+## UI Changes
+
+- Replace equipment/drawing combo boxes with a single format template text box
+- Keep 3 tabs: Log Events, Bill of Materials, Cut Templates
+- Keep Start/Stop button
+- Keep View Flip Decider dropdown