Maximum size of an exoskeletal creature

On a world I am building, I have a species of creatures that evolved from crustaceans. The problem is that while they have an exoskeleton, they also live on a world with the same gravity as Earth. I have thought of a few solutions, from an extra internal skeleton to internal exoskeleton partitions to hold critical organs in place, but they all seem to feel like excuses and not features.

What is the maximum size of an exoskeletal creature on a world with Earth-like gravity? What can be done to their biology to increase this size? What (other than the gravity) can be done to the planet to increase its maximum size?

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Maximum size of an exoskeletal creature

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