▣ Maker · CAD → 3D-Print · cad-render

Image or Text → a real, printable STL

Most "AI 3D" makes a display mesh that fails the moment a slicer touches it — holes, flipped normals, no wall thickness. cad-render takes the other road: it turns intent (a sentence or a reference image) into parametric OpenSCAD code, then renders genuinely watertight, manifold, millimetre-accurate geometry your slicer ingests with zero repair — and it stays editable. Two parts below, end to end, with the real .stl downloads.

capability

cad-render + cad-validate

examples

text → STL · image → STL

output

STL + 4-view + report

gate

watertight + manifold

validator

trimesh is_volume

The gate is non-negotiable. A part that's is_volume: false will look fine in the render and fail in the slicer. Every featured STL below was downloaded and validated with trimesh (is_watertight ∧ is_winding_consistent ⇒ is_volume). Only parts that pass are featured here.

Example 1 — Text → STL a parametric phone stand from one sentence

text-driven · functional part

Parametric phone stand

The text prompt → OpenSCAD a phone stand for a ~9mm phone+case, ~78mm back-rest, 62° lean, flat triangular foot (80×92mm) for stability, 3mm structural walls, a 5mm front lip so the phone can't slide off, side gussets tying the back rest to the base, and a 14mm cable pass-through. Units: mm.

4-view orthographic · front / right / top / iso — rendered from the cad-render STL

✓ WATERTIGHT + MANIFOLD — passes the gate

is_watertight	true
is_winding_consistent	true
is_volume (real solid)	true
volume	69,085 mm³
dimensions (x·y·z)	80.0 · 126.8 · 42.9 mm
min wall (design)	3.0 mm
triangles	488

⬇ Download phone-stand.stl 23.9 KB · ASCII STL

Drop it straight into Cura / PrusaSlicer / Bambu Studio — no mesh repair. The geometry is OpenSCAD code, so "make the foot wider" is one parameter away.

Example 2 — Image → STL a low-poly desk hook from a generated reference

image-driven · self-critique loop

Low-poly desk hook

We generated a clean reference image with flux-dev (single object, neutral background — exactly what cad-render reads best), then drove cad-render from the silhouette + proportion, reviewed the 4-view, and refined the wall + curl. Faceted octagonal cross-sections give the low-poly look while staying a fully closed solid.

flux-dev reference image — low-poly faceted desk hook on white background

Input reference — generated with flux-dev

4-view orthographic render of the low-poly desk hook — front, right, top, iso

4-view orthographic · front / right / top / iso — rendered from the cad-render STL

✓ WATERTIGHT + MANIFOLD — passes the gate

is_watertight	true
is_winding_consistent	true
is_volume (real solid)	true
volume	8,273 mm³
dimensions (x·y·z)	51.5 · 26.0 · 46.0 mm
min wall (design)	5.0 mm
triangles	466

⬇ Download desk-hook.stl 22.8 KB · ASCII STL

Two M4 screw clearances in the back plate, an octagonal load-bearing arm, and an upward curl that holds a cable, strap, or bag. Print flat against the back plate — no supports.

The workflow intent → code-CAD → validate → print

1 — create text OR image → create_cad_model → OpenSCAD source + 4-view PNG + report 2 — review read the front / right orthographic views: flat base? walls thick enough? nothing floating? 3 — refine refine_cad_model(critique) → thicker wall, wider foot, deeper lip … re-render (loop 1–3×) 4 — GATE export_stl + cad-validate → is_volume === true (ship ONLY if it passes) 5 — print download .stl → Cura / PrusaSlicer / Bambu → slice · print

Why it's slicer-ready the manufacture rules cad-render honors

Watertight + manifold

Parametric solids are closed by construction — no holes, no flipped normals. A slicer can always tell inside from outside. This is the gate.

Millimetres

Authored in mm, the unit every slicer assumes. The report's dimensions_mm is the real printed size — no mystery scale.

Walls ≥ 1.2mm

≥ 3 nozzle-widths so walls print solid, not ghosted. Both parts here use ≥ 3mm structural walls.

Flat base

FDM prints bed-up. Both parts have a flat footprint that sits on the plate — no supports needed.

Fits the bed

Clamped under ~256mm on every axis — fits a typical FDM build volume in one piece.

Editable code

The geometry is OpenSCAD, not a frozen mesh. Change one parameter and re-render — a mesh has no parameters to change.

Code-CAD vs. a learned mesh when to reach for which

If it needs to function — hold, clip, mount, stack, or fit a real object — reach for cad-render (this page). If it just needs to look like something — an organic creature, a sculptural hero asset for a render — reach for tripo-i3d / triposplat, and expect to repair the mesh before printing, if it's printable at all.

Reproduce this the playbook is open

Built from the cad-to-3d-print playbook — point it at a sentence or a clean reference image and it compiles parametric OpenSCAD, renders the 4-view, refines on a one-line critique, and gates on watertight + manifold before it hands you the download.