STL Viewer 3D - ModelHop

ModelHop is a fast, free STL viewer and 3D model viewer made for 3D printing. Open a model from Drive, Discord, email or a ZIP download, spin it with your finger, and know before you print: how big it is, whether it fits your printer, how much filament it uses and roughly how long it takes.

No pop-up ad when you open a file. No paywall. Every feature is free.

OPENS EVERY COMMON 3D FILE
• STL (binary and ASCII), 3MF, OBJ with materials, PLY, GLB / glTF, FBX
• G-code: preview the print path layer by layer
• ZIP files with many parts, like downloads from model sites: pick the part you want
• Open from any app: tap Share → ModelHop, or "Open with" in your file manager

MEASURE BEFORE YOU PRINT
• Exact width, depth and height in mm or inches
• Volume, surface area and triangle count
• Watertight check: see if the mesh has holes your slicer must repair
• Scale by percent or to an exact height, fix models exported in inches or cm
• Rotate 90° on any axis to find the best side to print on

WILL IT FIT MY PRINTER?
Pick your printer and ModelHop draws its build volume around the model and tells you if it fits, or if it would fit lying on another side. Includes Bambu Lab A1, A1 mini, P1S, X1C, Creality Ender-3, K1, K1 Max, Prusa MK4, MINI+, Elegoo Neptune 4, Anycubic Kobra 2 and popular resin printers.

FILAMENT, COST AND PRINT TIME
Choose PLA, PETG, ABS, ASA, TPU, Nylon or resin, set the infill and your spool price, and get the grams, metres of filament, cost and an estimated print time. It is an estimate from the mesh, handy for quotes and for deciding what to print; your slicer gives the exact numbers.

A VIEWER THAT FEELS GOOD
• Smooth GPU rendering, even for models with hundreds of thousands of triangles
• Solid, edges, wireframe and X-ray modes
• Cross-section: slice the model open to see walls and hidden parts
• Recolor in your filament color, turntable mode, top, front and side views
• Dark and light themes

EXPORT AND SHARE
Convert between STL, OBJ, GLB and PLY, or save a picture of your model with a transparent background.

PRIVATE BY DESIGN
Your files never leave your phone. ModelHop shows and measures everything on the device, works offline, and needs no account.

Supported: STL, 3MF, OBJ, PLY, GLB, glTF, FBX, G-code (.gcode, .gco), ZIP. STEP and native CAD files (Fusion, SolidWorks) need to be exported as STL or 3MF first.

Recent changes:
First release of ModelHop: a free STL and 3D model viewer for 3D printing.
• Opens STL, 3MF, OBJ, PLY, GLB, FBX, G-code and ZIP files
• Exact size, volume and watertight check
• Printer fit check, filament weight, cost and print time
• Cross-section, X-ray and G-code layer preview
• Export to STL, OBJ, GLB, PLY or PNG