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★★★★★
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• Will it print? One tap checks holes, bed fit, supports, the base, thin walls and loose parts. Share the result as an image. • Open G-code and sliced 3MF files to see print time, filament and layers. • The print estimate now works layer by layer, for a closer time. • Open a model straight from a Printables page or a file link. • Now in 27 languages. Your emails make this app better every day — thank you!
STL Viewer is a free, offline 3D model viewer for 3D printing on iPhone and iPad. It opens STL, 3MF, OBJ, PLY, OFF, 3DS, GLB and glTF files and G-code, checks whether a model will print, estimates time and filament, measures it, shows it in AR at real size and converts it to STL. Your models never leave your device and no account is needed. AT A GLANCE • 8 model formats plus G-code and sliced 3MF • Works offline, with no upload and no sign-up • Free: no subscription and no in-app purchase • No pop-up, timed or full-screen ads; at most one small banner • 27 languages, on iPhone and iPad WILL IT PRINT? One tap checks the model before you slice it: • Closed mesh, no holes • Fits your printer's bed, or fits once rotated • Overhangs that need supports • Enough contact with the bed • Walls too thin to print • Loose, floating parts Share the result as an image. SLICED FILES Open G-code and sliced 3MF files from PrusaSlicer, Bambu Studio, OrcaSlicer or Cura to see print time, filament and layer count, with the slicer's preview image. ZIP archives open too. MEASURE AND ESTIMATE THE PRINT • Measure the distance between any two points, in millimetres • See dimensions, volume, surface area and triangle count • Print estimate: weight, filament length, time and cost for your printer, material (PLA, PETG, ABS, ASA, TPU, Nylon), layer height, infill and walls, worked out layer by layer • Cut through the model with a section view VIEW IN AR AT REAL SIZE Place your model on a real desk or floor with AR Quick Look and see its true size before you print it. The camera is used only while AR is open. CONVERT AND EXPORT TO STL Turn an OBJ, 3MF, PLY, OFF, 3DS, GLB or glTF model into a binary STL in millimetres, ready for any slicer. Every triangle of the source is kept. OPEN FROM A LINK Paste a link to a Printables model page or to a file: it downloads straight from that site to your device. INSPECT AND SHARE • Orbit, pan, zoom; shaded or wireframe; perspective or orthographic • Six views from the view cube • Colour and surface: plastic, glossy, wood, stone or carbon • Share a 360° GIF, a 9:16 story video or an STL copy LOCAL AND PRIVATE Models are processed on your device. STL Viewer does not send model files, filenames, paths, geometry or dimensions to any cloud service, advertising provider or analytics platform. WHAT IT DOES NOT DO STL Viewer views, checks, measures, shares and converts. It does not edit, repair or slice models. Textures and animations are not loaded. Native CAD formats (STEP, IGES) need to be exported to STL, OBJ or 3MF first. QUESTIONS AND ANSWERS How do I open an STL file on iPhone? Tap Open file in STL Viewer, or choose STL Viewer from Open With or Share in the Files app. Will my model print? Open it and tap Print check: holes, bed fit, supports, base, thin walls and loose parts in one list. Can I open G-code on iPhone? Yes. G-code and sliced 3MF show print time, filament and layers from the slicer. Is it free and offline? Yes. No subscription, no in-app purchase, and everything runs on the device. Can I see an STL in AR at real size? Yes. Tap AR to place the model in your room. How do I convert OBJ, 3MF or GLB to STL? Open the model, tap Export, then Share as STL. Are my files uploaded anywhere? No. Models stay on your device.