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I'm just trying to help your design to be more accommodating to all...not just those with an "Ultimaker".
Looking over the design, I think I have an easy solution. Shorten the tail by 15mm. Then lengthen the support_anticouple by 15mm. That would make the Fuselage small enough for the Replicator 2, yet not affect the length of the tail for rotor clearance, and coupling effects.
Just a thought.