3D Printing Models

A collection of ASCII STL models for the Anycubic Kobra S1 Combo + ACE Pro (250 × 250 mm build plate).

Models

File	Description
models/wedge_100x20x40.stl	100 × 20 × 40 mm wedge
models/lineal-clip-kappe.stl	Snap-fit clip cap for the two holes at the end of a steel ruler (see example)

Setup

Python tooling for parametric model generation lives in a project-local virtual environment:

python -m venv .venv
.\.venv\Scripts\python.exe -m pip install -r requirements.txt

Generator scripts live in scripts/ and write their output to models/:

.\.venv\Scripts\python.exe scripts\lineal_clip_kappe.py

Example: From Photo to Printable STL

This walkthrough shows how the skills in this repo turn a photo plus a couple of measurements into a validated, printable STL. The example produces models/lineal-clip-kappe.stl — a small cap that clicks into the two holes at the end of a steel ruler.

1. Provide a photo with a scale reference

Place the object on graph paper (or next to a ruler/coin) so the agent can derive a scale. Here the 5 mm grid and the ruler's own cm scale give two independent references:

Then describe the intent, e.g.:

Create an STL file:

• the object should be a narrow rectangle that sits on top of the two holes
• it should have two bumps that fit exactly into the holes so it clicks in

2. The agent derives measurements from the image

The stl-from-image-measurements skill scales the image and reports what is measured versus inferred:

Dimension	Value	Source
Ruler width	14.5 mm	image scaling (5 mm grid ≈ 14.4 px/mm)
Hole diameter	2.5 mm	image scaling
Hole spacing (centre-to-centre)	9.1 mm	image scaling
Hole centre from top edge	3.2 mm	image scaling
Material thickness	2.0 mm	user supplied (not visible from a top view)

3. Confirm the fit-critical values

Anything that controls a fit is confirmed before geometry is built. In this run the agent asked three targeted questions:

1. Are the estimated hole diameter / spacing / width correct? → accept estimates
2. How thick is the ruler? → 2.0 mm
3. How should the bumps engage? → snap hooks with a retaining lip (audible click)

4. Geometry is generated as a parametric script

scripts/lineal_clip_kappe.py builds the solid with trimesh + manifold3d booleans, so every dimension stays editable:

• Plate: 14.5 × 7.0 × 2.0 mm
• Peg shaft ⌀2.30 mm = 2.5 mm hole − 0.20 mm press-fit clearance
• Shaft length 2.0 mm (= material thickness), then a ⌀3.00 mm barb with a 0.35 mm retaining ledge
• 1.4 mm lead-in cone (≈34°) for easy insertion
• 0.6 mm compliance slot per peg → two 0.85 mm spring legs so it actually snaps

5. Validate and preview

The validate-stl-mesh checks must all pass before the file is considered done:

facets: 972
extents: [14.5, 7.0, 5.4]
watertight: True
winding_consistent: True
euler: 2
degenerate: 0
volume_mm3: 217.761

The result is then opened in the STL canvas:

6. Print orientation

The model is exported in its print orientation: plate flat on the bed, snap pegs pointing up (+Z). No supports are needed — the only overhang is the 0.35 mm retaining ledge. In use the part is flipped and pressed onto the ruler.

7. Iterate

If the fit is too tight or too loose, adjust HOLE_DIA / PRESS_CLEAR in scripts/lineal_clip_kappe.py and re-run the script instead of editing the mesh.

Agent Skills

Skill	Description
anycubic-kobra-s1-ace-pro-profile	Printer defaults and constraints (bed size, nozzle, temperatures, wall minimums) for the Anycubic Kobra S1 Combo + ACE Pro. Referenced by other skills when authoring or editing STL files.
create-ascii-stl	Generates new ASCII STL files using print-safe defaults. Collects dimensions, material, use case, and multi-color requirements before producing any geometry.
edit-stl-transform	Edits existing STL geometry: scale, rotate, translate, merge, split, and origin alignment — while preserving manifold/watertight topology.
stl-create-edit-interview	Guided interview run before creating or editing STLs. Determines wall strategy, mesh pattern, infill strategy, and fit intent one question at a time.
stl-from-image-measurements	Creates or edits STLs from user photos plus measurements: identifies the object, researches existing models, derives scale from reference objects, and validates against printer constraints.
validate-stl-mesh	Validates an STL for manifold correctness and FDM printability: syntax, triangle count, watertight topology, normal consistency, and bed-fit.

Coordinate Convention

Models support both placement conventions on the 250 × 250 mm bed:

• Center-origin — XY target (0, 0)
• Corner-origin — XY target (125, 125) asödlj Convention is auto-detected from coordinates: negative XY implies center-origin, otherwise corner-origin. When ambiguous, corner-origin is used to match common slicer build-plate coordinates.