I've got several assets files, which for some reason have unused linked-materials (from external other files). This results in a big list of useless "Libraries", visible in the Outliner, "Blender file" type of information.

I tried to delete the materials by hand, with Shift + Click on the "Unlink datablock" button, save the file, then reopen it, but materials are still there.

unused linked materials

However, I tried to change the path of the linked libs by a non-existing file, directly in the Outliner, then saved the file and reopen it (twice). It worked. But too long and fastidious way to do that...

useless libraries list

My question is : is there a quick way (with scripting or via UI) to auto-unlink unused things ?

  • $\begingroup$ Are you sure there aren't any 'fake' users - the F button next to the material name? $\endgroup$
    – sambler
    Commented Aug 12, 2013 at 12:28
  • $\begingroup$ Yes I'm pretty sure... I added some images to the question to illustrate. BTW, the linked materials seems to have users. I guess it's the linked file's users, because in this scene there is no object who use those materials, just 1 object with the packed material ("Metal_Ancre"). $\endgroup$
    – Polosson
    Commented Aug 12, 2013 at 14:18
  • $\begingroup$ Is there any progress with the script, is there anything so far, probably you Plosson are very busy I guess, I have similar issue - I would go forward, what you think, is there any possibility to change this path in .blend file direct in python, without opening in Blender. Cause in my case there is a kind of BUG which makes the .blend file crash on open.. What do you think guys?? blenderartists.org/forum/showthread.php?360517-Please-help $\endgroup$
    – Ivaylo
    Commented Jan 22, 2015 at 18:48
  • $\begingroup$ Polosson did you finished your "group cleaner" script? $\endgroup$
    – user19113
    Commented Jan 25, 2016 at 9:50
  • $\begingroup$ Hey @jay27flow and Ivaylo, the script I made to clean uninstanciated groups and their libraries is downloadable here. Use it carefully! Cheers! $\endgroup$
    – Polosson
    Commented Jan 27, 2016 at 10:28

1 Answer 1


Blender does not save unlinked datablocks. Thus linked datablock always has a user in the file it was linked from. To remove from your scene you must first click the make local button and then it can be unlinked

  • $\begingroup$ Well, you're right, even if I knew it, I just realized that the users of those materials were some uninstantiated groups. By right-clicking on those groups in the Outliner, and choose "Unlink group" on each, then save, linked materials disappeared. Thx, btw! $\endgroup$
    – Polosson
    Commented Aug 12, 2013 at 19:14
  • $\begingroup$ Here's a script to auto-unlink groups that are not instantiated, and their libraries: polosson.com/public/scripts/AutoClean_groups.py.zip $\endgroup$
    – Polosson
    Commented Jan 27, 2016 at 10:29

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