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I just tried using Customiser and got the same error. I also ran the code directly through OpenScad and there were no errors or warnings.

It appears to be a general Customizer fault with Thingiverse. I suggest downloading the code, open with OpenScad and change the parameters in the header to create the result you want.

PS: Customizer is just a fancy script that runs OpenScad underneath :)

Cheers
Mike