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Free · runs in your browser · files stay on your device

Print Orientation Optimizer

Drop a model to find the best way to place it on the print bed. The tool tests a few hundred directions, shows the top 3 with their overhang area, a rough support volume, bed contact and height, and colours the overhangs red in 3D. Download the turned model as an STL. Nothing is uploaded.

Loading the orientation optimizer...

How to find the best print orientation

  1. 1

    Drop your model

    Drag an STL, OBJ, 3MF or GLB onto the tool, or press Choose file. It is read in your browser and never uploaded.

  2. 2

    Set the overhang angle

    Faces that lean past this angle from vertical need support. 45 degrees suits most FDM printers; raise it if your printer bridges well.

  3. 3

    Pick a priority

    Fewest supports, best bed adhesion, shortest print or balanced. The tool ranks the orientations again and shows the top 3.

  4. 4

    Preview and download

    Click a result to see it on the bed with overhangs in red, turn it 90 degrees by hand if you like, then download the STL and slice it.

What the numbers mean

All four are worked out from the mesh in your browser, for each direction tested. They are a check before you slice: your slicer still decides the real supports, time and filament.

OverhangArea of the faces that point down more steeply than your overhang angle (measured from vertical). Faces lying on the bed are not counted.
Support (estimate)Each overhang face's footprint times its height above the bed, added up. It ignores support that lands on the model itself and the slicer's infill density, so it is for comparing orientations, not a gram count.
Bed contactArea of the down-facing faces within 0.2 mm of the bed. More contact usually means a steadier first layer and less warping.
HeightHow tall the part stands. Fewer layers usually means a shorter print on FDM printers.
ScoreThe four numbers weighted by your priority, each compared with the worst direction tested. Lower is better.

Orientation tips

Lay big flat faces on the bed

A large flat face down gives the most contact and often removes most supports at once.

Keep the good side away from supports

Support marks the faces it touches. If one face must look clean, use the manual turns to keep it up or vertical.

Think about strength

FDM parts are weakest between layers. If a part takes a load, turn it so the force runs along the layers, even if it needs a bit more support.

Resin is different

For resin printers, a tilt of 20 to 45 degrees and supports on the back are common. Use this tool to compare overhangs, then follow your resin slicer.

Make a printable model from a photo with AI

No model yet? Turn a photo into a 3D model with an STL download, then bring it back here to find the best way to print it. The AI generators use credits; this optimizer does not.

Photo to STL with AI →Photo to 3D figurine

More free 3D printing tools

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Print orientation FAQ

Usually the one with the fewest overhangs and a large flat face on the bed, as low as possible. That often means laying the part on its biggest flat side. Strength, surface finish and accuracy can change the answer, so the tool shows the top 3 and lets you pick by priority.
It tests about 300 directions: the normals of the biggest flat areas of your model, 200 evenly spread directions and the 6 axis directions, then fine-tunes the best few by 5 and 2 degrees. Each one is scored on overhang area, a rough support volume, bed contact and height, weighted by your priority.
The 45 degree rule is the usual start: faces leaning less than 45 degrees from vertical print without support on most FDM printers. A well tuned printer with good cooling may manage 50 to 60 degrees. Set the angle you trust and the results update.
No. The file is read and analysed in your own browser, in a background thread, and never sent to our servers. The download is made on your device too.
STL (binary or ASCII), OBJ, 3MF and GLB, up to 100 MB and 1.5 million triangles. Units are taken as millimetres. GLB files are Y-up, so they are turned to Z-up first, as a slicer would.
Many do: Bambu Studio and OrcaSlicer have an auto orient button, PrusaSlicer has place on face, and Cura has orientation plugins. They are fine to use. This page is a quick check before you slice: you see the numbers for several options side by side, with the overhangs marked, and get a turned STL that opens the same way in any slicer.
Areas and heights are exact for the mesh you load. The support figure is an estimate for comparing orientations: real support depends on the slicer, its pattern and density, and on supports that rest on the part. Always check the slicer preview before a long print.
It is the same mesh with the same triangle count, only turned, centred on the bed and lowered so it rests at Z = 0. Colours, textures and separate objects are not kept, as STL holds one plain mesh.

Cura, PrusaSlicer, Bambu Studio and OrcaSlicer are named only to describe compatibility; The3DAI is not affiliated with or endorsed by them.