I’ve modified the onebox github_blob engine to display the stl model file using github’s render url.
https://github.com/discourse/onebox/pull/401
This is my first attempt at modifying onebox. Feedback is welcome.
I’m testing with “https://github.com/nophead/Mendel90/blob/master/dibond/stls/x_motor_bracket.stl” but that repo is full of stl files that you can test with.
Looks like the automated tests that are failing for onebox are failing since the version bump.
https://github.com/discourse/onebox/commit/6ab57eca8cf3d9ee8f7675bf5bd125403c00269b
@zogstrip @maja Can someone take a look at travis-ci and tell me why the tests are failing?
https://travis-ci.org/discourse/onebox/jobs/515606903
Gemfile.lock wasn’t updated with a new version after version bump, it should work now: https://github.com/discourse/onebox/commit/d0f99c5e66ac3c3732805c75498d92c4d410811d
Thanks. Since my pull request is still showing a travis-ci failure, should I close it and recreate it?
Thank you! I was just wishing for this today because I wanted to display as a model:
https://github.com/johnsonm/lathe-tool-models/blob/master/square-tool.stl
…and a visual model would be more compelling than the textual content! 
The current version does nothing to set the size of the iframe window so the rendered model is fairly small.
Looking at the youtube plugin, it uses 480x360 which seems like a good size.
As someone who creates models and intends to use this feature, I think that the 480x360 is a more meaningful aspect ratio for interactive content like this.
