Bone Heat Weighting Failed. No solution works

Question

I have an object, that always result in a "Bone Heat Weighting Failed" error when I try to set parents with automatic weights.

What I tried as a fix so far:

• It's only one lose part.
• Just using a single bone.
• Making sure scale of bone is applied.
• Making sure bone is inside mesh.
• Making sure they have the same origin.
• Remove doubles in mesh.
• Check normals.
• Applied modifiers.
• Checked vertex groups, UV maps.

Can someone with some rigging experience quickly take a look at the .blend file and help me out?

http://pasteall.org/blend/index.php?id=51166

Answer 1

The solution is to scale up your object, parent, then scale back down (if you want to). I gave it a quick test with a single bone, which failed at default size, but worked after scaling both objects by a factor of 10.

The reason this works is because the automatic weighting system has a hard time with vertices that are very close together. Scaling up spreads everything out, making it easier to calculate.

Answer 2

If you apply a Decimate>>Un-Subdivide>>2 Iterations modifier on this mesh the rigging will work and it will preserve the topology. If you want you can apply a subdivison surface modifier after it for the same resolution.

Answer 3

I tried scaling up the model delete duplicates recalculate normals and deleted vertex groups of the armature it worked