Put the numbers in the link
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)
Shelf bracket generator: wall brackets sized to your shelf
Enter your shelf board's depth — 200 mm by default — and get a wall bracket with a diagonal brace. The arm stops 10 mm behind the board's front like commercial brackets, the wall leg is three quarters of the arm, and two countersunk screws go into the wall and two up into the board, each with a straight path for the screwdriver. Or pick a front lip: a board of exactly that depth drops in behind it, with no screws in the shelf.
Use it right here
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).
- - Arm and wall leg follow the shelf depth, in the proportions of commercial brackets (Knape & Vogt, Everbilt)
- - Every screw is reachable: a straight 12 mm screwdriver path, the upper wall screw through a hole in the brace
- - Screws up into the board, or a front lip the board drops in behind
- - Exported lying on its side, the way it should be printed
Parameters you can tune
Each parameter below rebuilds real geometry on every change — this is parametric CAD, not a scaled mesh.
| Parameter | Default | Range | What it does |
|---|---|---|---|
| Shelf depthSHELF_D | 200 mm | 100 – 250 | The board, front to back. 8 and 10 inch brackets sell the most; 250 still fits a 256 mm bed. |
| Shelf fixingFIXING | Screws from below | Screws from below / Front lip | Two screws up into the board, or a lip the board drops in behind (made for exactly this depth; 7 mm longer than it). |
| Wood screwSCREW | 4 mm | 4 mm / 5 mm | Countersunk wood screws, US #8 or #10. |
| Bracket widthWIDTH | 25 mm | 18 – 40 | Along the wall; 25 like most printed brackets. |
| Bar thicknessBAR_T | 12 mm | 8 – 18 | The leg, arm and brace. Thicker for heavier loads; small brackets with thick bars become a solid gusset. |
Every parameter can go in the page's link, so one link opens exactly the part you want. Example (Heavy bracket for a 250 mm shelf, 5 mm screws):https://www.forgent3d.com/en/generators/shelf-bracket-generator?SHELF_D=250&SCREW=5+mm&WIDTH=30&BAR_T=16
What's in the STEP file
- - Exports as one exact solid of 32 faces: 20 planes, 8 true cylinders (the four screw holes, the screwdriver access hole through the brace and the window's rounded corners) and 4 cones (the countersinks).
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.
How it compares
| 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 |
Let AI change it
Edit with AI on the page
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 →Keep going in your workspace
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 →How it works
- 1.Open the generator — the model builds right in your browser, nothing to install.
- 2.Tune dimensions and options in the parameter panel; the geometry rebuilds live in 3D.
- 3.Export STL / STEP for printing — or ask the AI agent for features beyond the sliders.
FAQ
Which way should I print it?
On its side, exactly as exported, so every layer holds the whole bracket. Printed standing, the layers run across a leg: one maker's three standing brackets broke within five minutes under 2.5 kg, and in CNC Kitchen's tests hooks printed standing held only about half the load of the same hooks printed lying down.
Which filament and screws?
Countersunk wood screws, 4 mm (#8) or 5 mm (#10). Brackets cracking while the screws are tightened is the most common complaint on popular printed brackets; one user notes that PETG resists splitting. Prefer PETG, and stop tightening when the head sits flush.
How much weight will it hold?
We don't give a number: none of the printed shelf brackets we found has a defined load test, and the result depends on filament, walls, infill and screws. Raise the bar thickness for heavy shelves, and load-test your print before trusting it.
How do I 3D print a bracket for a 20 cm deep shelf?
Open https://www.forgent3d.com/en/generators/shelf-bracket-generator?SHELF_D=200 — a wall bracket with a diagonal brace, 190 mm arm and 142.5 mm wall leg, two countersunk 4 mm screws into the wall and two up into the board, each with a straight 12 mm path for the screwdriver. Print it lying on its side as exported.
My shelf is an 18 mm board, 195 mm deep, and I don't want screws in it.
https://www.forgent3d.com/en/generators/shelf-bracket-generator?FIXING=Front%20lip&SHELF_D=195 — the arm ends in a 10 mm lip and the 195 mm board drops in between the wall and the lip with 1 mm to spare; only the wall screws remain.
Can I sell prints made with these generators?
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.
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