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Can the glTF format be used for 3D printing?

If not, is there any tool can convert it to another format such as STL, OBJ, STEP, and IGES?

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As far as can be found it should be possible to convert glTF into STL (or OBJ).

You could try to use an online converter to do this, e.g. this one (greentoken); and this (assimp) may be useful too.

According to this greentoken supports glTF as input and STL as output, but it is reported by @Trish that that does not work. Assimp could output STL files which then could be used by slicer programs to generate the specific G-code file to print the model on your printer.

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    $\begingroup$ Greentoken does not accept GLTF, Assimp though does. $\endgroup$ – Trish Sep 12 '18 at 13:42
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No, gltf is not a format that slicers accept commonly, and indeed, it is not even intended to be reverseable in the 1.0 format version. This has changed a little for the 2.0 standard. Some programs that allow exporting into the sliceable stl and obj formats can also import gltf:

You have to be careful though: formats like dae or stl are meant to transfer 3d objects usually without the loss of information or with just a minimal loss (stl, for example, does technically not contain a scale natively), while gltf is end users and does not contain all the information. This can lead to models getting distorted and destroyed on importing them into a rendering or modeling software.

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