[OpenSCAD] New 3MF file format

doug moen doug at moens.org
Wed May 27 07:34:37 EDT 2015

The only version of the AMF spec that I've studied is the 0.47 draft from
this URL:


If there are substantive differences in the $49 version, I have no way of
finding about them. The legal risks involved in obtaining the actual
standard sound too high. If I create a context diff comparing 0.47 with
1.0, I'm breaking the law. On the other hand, most of the other people
implementing AMF are probably also basing their implementation on V0.47, so
whatever text happens to be in the pay version of the AMF standard probably
doesn't matter all that much.

I agree that Microsoft has done a better job, in making their standard
freely available and explicitly royalty free.

On 27 May 2015 at 05:28, Bob Cousins <bobcousins42 at googlemail.com> wrote:

> The DRM relevant features of the spec are all optional, the only required
> part is the 3D model. So I think a conformant implementation need not
> process any DRM.
> I understand there is great suspicion of Microsoft, but in my reading 3MF
> is a genuinely open spec, there are no strings attached. It actually makes
> clear it is royalty free, unlike AMF. It also can be freely downloaded,
> unlike AMF which costs $49 and you have to agree to inspection of your
> premises and computer systems by a third party to ensure you are complying
> with the copyright (i.e. not made ANY copies), otherwise the agreement is
> cancelled and you must destroy all copies.
> Personally I find it a lot easier to implement 3MF than AMF.
> On 27 May 2015 at 08:02, frankv <drifter.frank at gmail.com> wrote:
>> A skim through http://bit.ly/1KqwpFU suggests that the "royalty-free
>> patent
>> license" requires a "conformant application" to be produced, and I have no
>> doubt that "conformant" will require DRM, so that a 3MF derivative without
>> DRM would be subject to lawsuits and monetization.
>> --
>> View this message in context:
>> http://forum.openscad.org/New-3MF-file-format-tp12525p12755.html
>> Sent from the OpenSCAD mailing list archive at Nabble.com.
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