MakerWorld to Snapmaker U1 — Chrome Extension

This document describes what data the extension accesses and how it is handled,
based on the current implementation.



The extension operates on MakerWorld model pages to:

1. Inject a Snapmaker U1 option into the printer filter carousel.
2. Intercept MakerWorld's own authenticated .3mf download when the user
   clicks Convert to Snapmaker U1.
3. Convert the downloaded .3mf file locally in the browser using bundled
   JavaScript logic.
4. Trigger a file download of the converted .3mf to the user's device.

| Data | Purpose | Stored? | Transmitted? |
|---|---|---|---|
| MakerWorld page DOM | Inject U1 carousel option and intercept download | No | No |
| .3mf file downloaded from MakerWorld | In-browser conversion | No | No |
| Extension settings (print profile, converter options and user preferences) | User preferences | Browser storage only | No |


The extension uses MakerWorld's existing authenticated download flow by
intercepting the network request that MakerWorld itself initiates when the
user clicks its own download button. The extension does not:

• Read, log, or store MakerWorld passwords
• Read, copy, or transmit browser cookies or session tokens
• Make authenticated requests to MakerWorld on its own, separate from the
  user's own browser session

The downloaded .3mf file is converted entirely within the browser using
bundled JavaScript code. The file is not uploaded to any server operated by
this project.


User settings (selected print profile, converter options, filament preset mode
and other user preferences) are stored in chrome.storage.sync. This storage is managed by
the browser and may be synced across devices by the browser's built-in sync
feature if the user has browser sync enabled. No settings data is transmitted
to servers operated by this project.


This extension does not include analytics, crash reporting, telemetry, or
remote error reporting of any kind.


The extension interacts only with:

• MakerWorld (makerworld.com) — to intercept the user-initiated download
• Chrome extension APIs — for storage and downloads

No other third-party services are contacted by this extension.


Accessing MakerWorld is subject to MakerWorld's own privacy policy and terms
of service. This extension does not modify or override those policies.


If the extension's data practices change in a future version, this file will
be updated accordingly.