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I think ABS should be fine. The only question is the spring. I know my polymax spring lasts for a long time, I never had one fail. ABS should be as durable, and then it becomes a matter of stiffness. I'm not sure if it would tick faster or slower... but in the end that shouldn't matter either since if you're using it as a timer you could just time it with the different springrate and never know the difference.