I just bought a set of Aeropress Go, but found that all the cups I used with the original version Aeropress are not fitting any more. The edge that Aeropress Go sits on the cup is much narrower than that of Aeropress Original. So I measured the widths of both models to help me find the right cups.

Conclusion

• Minimum inner diameter of the mugs: 70mm / 2.75 in
  Whether the original Filter Cap or a third-party Flow Control Filter Cap, the diameter is around 68.x mm, so a cup with an inner diameter of 70mm will definitely fit.
• Maximum inner diameter of the mugs
  • Aeropress Original
    70~90mm / 2.75~3.55 in, not larger than 102mm / 4.00 in
  • Aeropress Go
    70~80mm / 2.75~3.15 in, not larger than 89mm / 3.50 in

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Inner Diameter for the Mugs

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Depth