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I'm trying this again, this time with a shop that does Nylon. Part of my problem was trying to work with the piece before getting the Nimble/mount/Piezo20 together as a unit and then mounting the hotend up through the effector and locking it into the Piezo20 and then making the final step the careful insertion of screws through the Nimble mount and into the studs. The order of assembly turned out to be more important as it eliminates chances to torque those top studs. (I'm also hoping that my Piezo20's arrive with a bit smaller footprint than my ABS printed mockup as I had to trim a bit to fit it between the remaining bits of studs I had left from my last attempt).

Thanks for the Molex info, I ordered enough to make up 4 sets.

One last observation, the little notch at the bottom of the cooling fan mount to allow space for the fan's bit that holds the halves together either needs to be wider (variability in these fans from one manufacturer to another), or get rid of the notch and trim the bit off the edge of the fan. The mount is quite snug and holds that side of the fan together without it.