3D Model Viewer
View 3D models (STL, OBJ, PLY) on your phone, tablet, or VR
Screenshots

Hunter's comment
A free app to view 3D models that you have downloaded, or open 3D models directly from your browser. Tap and drag to rotate the model, or pinch to zoom.
Tap the VR button at the bottom of the display to switch to VR mode, and view the model in your favorite VR headset, such as Cardboard or Daydream.
Link
https://play.google.com/store/apps/details?id=com.dmitrybrant.modelviewer
Contributors
Hunter: @muhammad007

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