STL Viewer support

Help with opening files, units, the filament estimate and Premium, plus how to contact the developer.

Contact

Email ihwan.id@icloud.com. Please mention your phone model, Android version and the file format. You don't need to send the model; if you do, it is used only to fix the problem and then deleted.

Common problems

• A file won't open. Check the format: STL, OBJ, 3MF and PLY are supported. For STEP, GLB, SCAD and others, export STL from your 3D software first. See how to open files.
• The model is tiny or huge. It was probably drawn in inches. Switch the file units in the info panel. See model info.
• The OBJ has no colors. Pick the .mtl file together with the .obj in the file picker.
• I bought Premium but still see ads. Purchases belong to your Google account: make sure Google Play on this device uses the account you bought with, then reopen the app. If ads still show, email us.

Privacy

No account, no uploads. Read the full Privacy policy.

Questions and answers

Is STL Viewer free?

Yes. Opening every supported format, all view modes, model info and the filament estimate are free. Premium adds Measure, Section, Scale & export, Compare, unlimited recent files and no ads.

Does the STL viewer work offline?

Yes. Viewing, model info and the filament estimate need no internet. A connection is only used for ads and purchases.

Is there a version for iPhone, Windows or Mac?

No. STL Viewer is an Android app for phones and tablets, available on Google Play.

Which units does it use?

STL, OBJ and PLY files store no unit, so millimeters are assumed; switch a file to inches if it was drawn in inches. 3MF files declare their unit. Sizes are shown in mm or inches, as you prefer.

Why is the filament amount an estimate?

It assumes a 0.8 mm solid shell (about two 0.4 mm lines) and your infill inside. Supports, brims and slicer settings change the real amount.

Are my files uploaded anywhere?

No. STL Viewer processes models on your device and never uploads them. There is no account.