@uncle_bob: With 400mm diameter by 500mm tall build volume you get 2^3=8 times the volume. Scaling is easy for this situation. Just double everything from my design. 4' screws will get you almost exactly that volume. 5' screws using the same screw spacing could get you 400mm diameter by 800mm tall. (Any extra length you add to the screw goes directly onto the print volume if you keep the screw spacing the same.)
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