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What is the difference between your left and right lid designs? Are the threads for everything right handed?
Also when using: OpenSCAD version 2015.03-2
I got the message:
Compiling design (CSG Tree generation)...
DEPRECATED: The assign() module will be removed in future releases. Use a regular assignment instead.
I'm pretty unfamilar with SCAD but is this something easy for you to fix in your next release?