Complicated carve has me beat

This file has a couple of problems:

  • overlapping/intersecting geometry:

  • open/unclosed geometry (indicated by being magenta):

There was a discussion of a slightly different version at:

There are a couple of ways that this file could be fixed/modified — one more interesting question is the matter of how the chain might be handled — making it appear 3D could be done in a couple of ways…