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Hi, for a standard Prusa i3 6mm is enough. I designed the extruder in this way tryng to balance the mass and avoiding a torque on the X smooth rods. The best would be to move the Z-X structure 6mm far from the frame. In my upgrade kit for the Hephestos I redesigned the lower and upper Z support. I know that this is harder with the Prusa Steel. Please send me some pics and I' ll try to redesign the X-Carriage .

This is my email: franci.gianni61@libero.it