Auto-orient STL for 3D printing: least support, online

No file handy?

What this tool does

Tries hundreds of orientations: the model's largest flat faces, the six axes and directions spread over the whole sphere.

Four priorities: balanced, least support, fastest (the lowest height) or sturdiest (the most area on the bed).

Works out support with your printer's overhang angle and measures with rays how far each overhang really drops, to the bed or to the part itself.

Paints in red the faces that will need support, so you can pick an orientation where the face that matters stays clean.

Warns when the turned part does not fit your printer's bed and downloads the turned model as STL or 3MF.

Takes STL, OBJ, PLY, GLB, 3MF, STEP and more; everything runs in your browser, without uploading the file.

How it works

Load the model

Drop your file or try the sample lighthouse. The tool analyzes it on a background thread, without freezing the page.

Choose what matters

Balanced, least support, fastest or sturdiest, and the angle from which your slicer adds support. The list shows support grams, base area and height for every option.

Download it turned

See in red what will need support, fine-tune with 90° turns if you like, and get the STL or 3MF already resting on the bed.

Frequently asked questions

What is the best orientation for 3D printing?

It depends on what matters most, which is why ilove3d's Auto-orient offers four criteria. Least support saves material and leaves fewer rough faces; fastest looks for the lowest height, since print time grows with the number of layers; sturdiest rests the most area possible, so the part neither lifts nor tips over; and balanced weighs all three. For every option you see the estimated support grams, the area on the bed and the height, and in red which faces will need support.

What is the overhang angle?

It is the steepness from which a wall prints over thin air and the slicer adds support under it. 45° is the FDM norm: a wall leaning further than that, seen from below, falls over nothing. With good cooling and PLA many printers handle 55° or 60°, and then less support is needed. Set it to the value your slicer uses and the estimate will match what it generates.

How are the support grams worked out?

For every face that needs support, it measures the distance down to the surface below, which can be the bed or the part itself, and adds up the volume of those columns. It turns that into grams assuming regular 25% support in PLA. Tree supports usually take less, so read it as a comparison between orientations rather than the exact figure your slicer will give.

Is my file uploaded to a server?

No. The model opens from your disk and the analysis runs on your computer, on a background thread of the browser; neither the geometry nor the result leaves it. No account needed, and it is free.

Question of the month

Which printer do you use?