STL Viewer AR: Print Preview
Effective 31 August 2026 · com.arzDrzapps.stl_print_preview
The STL files you open never leave your phone. The app does its work on your own device.
This policy covers the mobile app STL Viewer AR: Print Preview, published by Akshay CP on Google Play. The app opens .stl files, shows them in 3D and in augmented reality at their real printed size, and works out whether a model fits your printer and what it will cost in filament.
The STL files you open stay on your device. The app does the work locally, using your phone's own processor and storage. Nothing you create or open is uploaded to me or to anyone else, and I have no way to see it.
Anything the app saves is written where you ask it to be written, and any list of recent items exists only on your device. Uninstalling the app removes it.
The app itself does not use your camera. When you choose to view a model in augmented reality, it hands the model to Google's Scene Viewer, the AR component built into Android, which opens the camera on its own terms under Google's privacy policy.
The free version of the app shows ads supplied by Google AdMob. To serve them, AdMob may access your device's advertising identifier — the Advertising ID — along with general information about your device such as its model, operating system version, language, rough location derived from your IP address, and how you interact with ads.
That information is handled by Google under its own privacy policy, which you can read at policies.google.com/privacy.
AdMob does not always supply the ad itself. It also passes the request on to partner ad networks and shows whichever one bids highest — in this app, Unity Ads and Meta Audience Network. When a partner network fills the slot it receives the same kind of information described above, including your advertising identifier, and handles it under its own privacy policy: Unity Ads and Meta Audience Network.
On Android, you can reset or delete your Advertising ID at any time in your device settings under Google › Ads.
Making the purchase described below stops ads being shown and stops the advertising identifier being used for advertising in this app.
The app offers a one-time purchase that unlocks its paid features and removes ads. Payments are processed by the store you installed the app from — Google Play Billing. I never see or store your card details. The app only records, on your own device, whether the purchase was made.
I do not run a server for this app. There are no accounts, no logins, and no analytics of my own. I do not collect your name, email address, contacts, photos or documents. The only data leaving your device is what Google AdMob and its partner ad networks collect to show ads, as described above.
This app is a general-purpose tool and is not directed at children under 13. I do not knowingly collect personal information from children. If you believe a child has provided personal information, please get in touch and I will look into it.
If this policy changes, the updated version will be posted on this page with a new effective date.
Questions about this policy, or about anything the app does, are welcome at contact.akshaycp@gmail.com.