Set the mouth, the spout and the cone height, and get a funnel that actually fits your jar, jerrycan or filament-dry box. It generates as watertight CAD with a smooth interior, plus an optional loop to hang it up to drain.
The real generator runs in your browser: set the parameters, then download STEP or STL. Nothing to install, no sign-up.
The first open downloads the CAD engine (about 20 MB).
Each parameter below rebuilds real geometry on every change — this is parametric CAD, not a scaled mesh.
| Parameter | Default | Range | What it does |
|---|---|---|---|
| Mouth diameterMOUTH_D | 90 mm | 30 – 200 | Top opening diameter. |
| Spout diameterSPOUT_D | 12 mm | 3 – 60 | Inner diameter of the outlet tube. |
| Spout lengthSPOUT_LEN | 40 mm | 10 – 120 | Length of the straight outlet tube. |
| Cone heightCONE_H | 60 mm | 20 – 150 | Height of the conical section. |
| Wall thicknessWALL | 1.6 mm | 1.2 – 3 | 1.6 mm = four perimeters. |
| Hanging loopHANG_LOOP | True | on / off | Rim tab with a hole to hang the funnel. |
Every parameter can go in the page's link, so one link opens exactly the part you want. Example (120 mm mouth, 8 mm spout bore, 30 mm spout):https://www.forgent3d.com/en/generators/funnel-generator?MOUTH_D=120&SPOUT_D=8&SPOUT_LEN=30
STEP AP214 in millimetres, exact B-rep — it opens directly in SolidWorks, Fusion, FreeCAD, Onshape or Inventor, and goes straight into a CNC quote form. STL for the slicer is one click too.
| This generator | Typical online STL generator | Vendor CAD library | |
|---|---|---|---|
| Any size within the range | Yes | Yes | Catalog sizes only |
| STEP with exact surfaces | Yes | Usually an STL mesh only | Yes |
| Changes the sliders don't cover | “AI edit” on the page | No | No |
| Account needed to download | No | Usually no | Often |
Every parameter is a link parameter; the link below opens the example part. ChatGPT, Claude or any assistant can write one like it from the parameter list (names, units, ranges) at: parameter list (JSON)
Example: https://www.forgent3d.com/en/generators/funnel-generator?MOUTH_D=120&SPOUT_D=8&SPOUT_LEN=30
Press “AI edit” in the generator and say what to change — a keyway, holes, a different shape. The AI edits the part's model.py and it rebuilds in your browser, with undo. A few edits a day are free without signing in; to keep the result or go further, copy it into your models and continue with the AI agent.
Edit with AI →For bigger changes, several rounds, or a part you want to keep: copy it into your models (free account). The Forgent3D AI agent reads the model.py, edits it, rebuilds it and checks the result itself.
Copy and continue with the AI agent →FDM prints have layer grooves that can trap residue, so treat printed funnels as workshop tools by default. For kitchen use, print in PETG, wash promptly, and treat it as a short-lived utensil; where food safety matters, buy a food-grade funnel.
Glugging means air can't escape the container. Make the spout a little narrower than the container neck so air passes beside it, or ask the AI agent to add external ribs on the spout — the classic anti-glug feature.
Three to four perimeters (the default 1.6 mm wall), 0.2 mm layers, and slight over-extrusion or 'iron' the cone if your slicer supports it. PETG at higher temperatures self-seals better than PLA.
The spout’s outside is SPOUT_D plus two walls (1.6 mm each by default), so for a 16 mm opening use SPOUT_D=12, which is 15.2 mm outside and leaves room for air to escape: https://www.forgent3d.com/en/generators/funnel-generator?SPOUT_D=12&MOUTH_D=100. Download STL to print it.
Press “AI edit” in the generator and describe it; the AI edits the funnel’s model.py on the page and it rebuilds in your browser. A few edits a day are free without signing in.
Yes. Models you generate and the STL / STEP files you export are yours: print them, sell the prints, or use them in a product. No attribution to Forgent3D is required.
Already have your own .scad file? Convert OpenSCAD to STEP → · Preview it in the browser →
