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I haven't yet installed the tighter fit carriages yet, but my extruder is attached by the very long M3 screws that attach the printed extruder parts to the carriage as well as the zip tie that secures the extruder motor better. It's fairly secure considering that the pieces attach carriage -> extruder parts -> extruder motor. I'd love to see what you can whip up though to make a better motor connection. Let me know how it goes!