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Recently, I used mesh deform modifier with armature to animate a character, but after clicking on the "bind" button, I saw that not all the mesh was deformed by the cage, so I clicked "unbind."
I've repeated this action about 7 times and finally I got the results that I want. BUT the problem is after saving my project, my blend file became very very large: about 800Mb.

Why does it happen? How to reduce my blend file size?

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  • $\begingroup$ How many objects are in your scene? What was the file size before you noticed the huge jump? $\endgroup$
    – David
    Dec 19 '16 at 1:13
  • $\begingroup$ Before the huge jump, the blend file was about 60Mb, I think there was about 20 meshes in my scene $\endgroup$
    – YôL
    Dec 19 '16 at 2:56
  • $\begingroup$ I have the same issue. It seems it's some kind of a bug in blender. If you have subdivision modifiers applied to the mesh put surface deform before it. This helps. $\endgroup$ Apr 2 '20 at 15:59
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Unbinding the Modifier should reduce your file size to the previous 60Mb, but the deformation data from your binding will be deleted.

Same with the Surface Deform Modifier. I recommend to keep the modifier unbinded and bind it only before final render (if your workflow allows that).

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Apply the Mesh Modifier and the size will be good.

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