The Chamfilletizer

Mode:

Global Selective

Threshold:

Size (mm):

Ratio: 40%

THE CHAMFILLETIZER

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About The Chamfilletizer

This is intended to be a "pretty good" tool for applying simple chamfers, fillets, and hybrid chamfillets to basic STL files. It is a quick-fix for the most common applications rather than a silver bullet for highly complex meshes.

How to Use

Load a Model: Click "Choose File" to load your STL. The app will automatically repair minor mesh issues and center the camera.
Select Edges: In Global mode, the threshold slider picks all sharp edges. Switch to Selective mode to click specific edges, or use the selection macros on the left. FYI, you can select connected edges by double-clicking.
Configure Cut: Choose Standard Chamfer, Pure Fillet, or Hybrid Chamfillet. There is a preview window on the right that shows a cross-section of the cutter you have chosen. Adjust the size and ratio to fit your needs.
Queue & Execute: Click "Add to Queue" to prep the cut. You can add multiple cuts to the queue. Once ready, click "Execute Queue" to perform the boolean operation.
Export: Click "Export STL" to save your modified mesh for slicing.

Selection Macros

Base Edges: Selects only edges sitting flat on the build plate (great for fighting elephant's foot).
All But Base: Selects everything *except* the build plate edges.
Top Edges: Selects edges at the absolute highest point of the model.
Verticals: Selects straight up-and-down edges (great for rounding sharp box corners).
Horizontals: Selects any edge parallel to the floor, regardless of height.

Frequently Asked Questions

What kind of models work best?
Functional, mechanical parts. If you are modifying a simple bracket, a cable winder, or a modular storage crate, this tool works great. Highly organic models may have too many intersecting faces for the edge-cutters to resolve cleanly.

Why is a cut failing or taking so long?
Processing is done entirely locally in your browser. High-polygon STLs take longer to calculate. If the tool folds over itself on very tight corners, it will skip the cut to prevent breaking the mesh. Try a smaller size.

What is a "chamfillet"?
A chamfillet is a hybrid edge treatment combining a chamfer and a fillet, designed specifically for FDM 3D printing. Standard rounded fillets create extreme overhangs that print poorly. A chamfillet solves this by starting with a straight, printable chamfer at the base, which smoothly transitions into a curved fillet. This provides the aesthetic of a rounded bottom edge without requiring support material.

Why did my model disappear?
Your original STL must be manifold (watertight). If the mesh has holes, non-manifold edges, or severe self-intersections, the boolean math will fail. Repair the STL in your slicer or CAD software first.

Is my data sent anywhere?
No. The entire application runs locally. No STLs are ever uploaded to a server.

Feedback

Have a bug report, feature request, or just want to share a successful print?

Copyright & Licensing

This software is free to use, modify, and distribute for noncommercial purposes under the PolyForm Noncommercial License 1.0. It is perfect for hobbyists, educational use, and personal FDM printing workflows.

Restrictions: You may not monetize this software, re-host it behind ads or paywalls, or integrate it into a commercial product or service without prior written authorization.

Note: This license applies to the software code itself. The output STLs you generate belong entirely to you, and you may use or sell those physical prints or digital files however you wish.

For the full legal text, visit PolyFormProject.org.

Privacy Policy

Last updated: September 2026

1. Your 3D Models and Data
The Chamfilletizer is a client-side WebAssembly application. All 3D model processing and edge modifications happen entirely locally on your device. We do not upload, collect, store, or have access to your STL files or design data.

2. Cookies and Third-Party Advertising
To keep this tool free, we use third-party advertising companies to serve ads when you visit our website. These companies may use cookies to serve ads based on your prior visits to this website or other websites.

Third-party vendors, including Google, use cookies to serve ads based on a user's prior visits to your website or other websites.
Google's use of advertising cookies enables it and its partners to serve ads to your users based on their visit to your sites and/or other sites on the Internet.
Users may opt out of personalized advertising by visiting Google Ads Settings or by visiting www.aboutads.info.

3. Analytics
We may use basic, anonymized web analytics to monitor site traffic and tool usage. This data contains no personally identifiable information.

4. Contact
If you have questions about this privacy policy, please use the Feedback email tool located in the FAQ tab.