# Examples: OpenRun 42 "Wide"

| File | What it is |
| --- | --- |
| `OpenRun42-Wide.shoelast` | A Shoelast Designer project with two variants. The active variant **Wide** carries three applied edits; **Original** is the unedited last. It includes the edit history and both variants' exact shapes. |
| `OpenRun42-Wide.stl` | Binary STL of the **Wide** variant in millimetres. Its header reads `Shoelast Designer STL units=mm OpenRun 42 by Open Footwear CC BY-SA 4.0 modified`. |

## How they were made

They were generated by the `RealLastExample` test through the same edit path the app uses,
`EditPipeline`, with manual commands:

```
SHOELAST_WRITE_EXAMPLES=$PWD/Examples swift test --package-path Packages/LastKit --filter RealLastExample
```

1. Load the bundled **OpenRun Running Last, EU 42** template (left last) through
   `TemplateLibrary.load`, which applies the disclosed template preprocessing: the file's folded
   micro-flaps are retriangulated by edge flips, without moving any vertex
   (`docs/CONVENTIONS.md` §6.2).
2. Create the variant **Wide** and duplicate it as **Original**. Original stays at revision 0
   with no edits.
3. Commit three separate edits to Wide. Each edit increments the revision and writes an
   `OperationRecord`, and must pass strict commit validation, as Apply requires. The heel is
   preserved throughout, and its core is verified bit-identical.

   | Revision | Edit | Primary measurement |
   | --- | --- | --- |
   | 1 | Forefoot Width +4.0 mm | ball width 104.09 → 108.09 mm |
   | 2 | Toe Spring +2.0 mm | toe spring 8.68 → 10.68 mm |
   | 3 | Instep Fullness +2.0 mm | instep height 74.54 → 76.54 mm (a vertical lift: the height changes by the amount; see `docs/CONVENTIONS.md` §4) |

4. Write both files, then read them back and verify them:
   - the project reopens equal to what was saved, with bit-exact shapes;
   - the STL re-welds to the same 116,744 triangles and 58,374 vertices, with a largest vertex
     deviation of 8.1e-6 mm against the design (the export tolerance is 0.05 mm);
   - the Wide shape and the STL as read back both pass strict validation.

Identifiers and dates are fixed, so rerunning the command reproduces both files byte for byte.

## Measurements (mm)

| Measurement | Original | Wide | Change |
| --- | ---: | ---: | ---: |
| Length | 279.93 | 279.93 | +0.00 |
| Ball Width | 104.09 | 108.09 | +4.00 |
| Heel Width | 68.66 | 68.66 | +0.00 |
| Toe Height | 32.82 | 32.82 | +0.00 |
| Instep Height | 74.54 | 76.54 | +2.00 |
| Toe Spring | 8.68 | 10.68 | +2.00 |
| Heel Elevation | 12.94 | 12.94 | +0.00 |
| Ball Section Perimeter | 258.19 | 266.01 | +7.82 |
| Instep Section Perimeter | 258.38 | 263.68 | +5.29 |
| Waist Section Perimeter | 266.90 | 270.46 | +3.56 |

**Bounding dimensions (L × W × H):** original 279.93 × 105.41 × 102.14 mm; Wide
279.93 × 109.46 × 101.97 mm. The STL reads back at 279.928 × 109.463 × 101.972 mm.

- The height drops slightly because toe spring lifts the forefoot plantar bump, which is the
  original lowest point. Edits do not re-ground the last.
- Section perimeters are not girths.

## Validation status

- **Strictly valid.** All three steps pass the app's commit validation, and the final shape is
  a closed, manifold, consistently and outwardly oriented surface with no degenerate triangles
  and **no self-intersection at all**. There is no source baseline to exclude: the template
  preprocessing removed the original file's 16 touching pairs together with its folded flaps.
- The STL, read back and welded, passes the same strict validation.
- The STL was written by the test harness, which performs the same write, read-back and
  0.05 mm comparison as the app's export, but not through the app itself.

How a slicer treats the file has not been tested. Inspect the sliced and printed result as with
any prototype.

## Provenance and licence (share-alike)

Both files are **adaptations** of **"OpenRun shoe last (size 42)" by Open Footwear**
(openfootwear.com):

- Source: https://www.printables.com/model/491369-openrun-shoe-last-size-42
- Source file SHA-256: `3b9451c316cff378b8ba77945eebaca8b10216751df22e8327a8e8d0c0d63645`
- Licence: **CC BY-SA 4.0**, https://creativecommons.org/licenses/by-sa/4.0/

**Changes made:** the last was re-expressed in Shoelast Designer's canonical frame (rotation and
translation only); its triangulation was changed by edge flips at 593 folded micro-flaps and
needle triangles (1,742 of 116,744 triangles re-split, no vertex moved, surface
deviation at most 0.22 mm; see `docs/CONVENTIONS.md` §6.2); then it was edited with Forefoot
Width +4 mm, Toe Spring +2 mm and Instep Fullness +2 mm, as listed above.

These example files are therefore licensed under **CC BY-SA 4.0**. If you share them or
anything derived from them, you must:

- keep this attribution;
- state your changes;
- license the result under CC BY-SA 4.0.

The licence does not cover the Shoelast Designer source code.

These are **prototype lasts**, not approved or certified lasts. Check fit and dimensions
physically, ideally with a last maker, before making shoes on them.