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If you need a bit more flex range in some joints (or maybe an articulated spine?), I remixed a few pieces crudely from modibot. https://www.thingiverse.com/thing:2222859

If your joints are the same, they should work without any modding. Feel free to mod mine, just make sure to give some props to Kidmechano and keep the license the same.

ModiBot Mo extra flex connectors