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Sorry you're having bad luck with it. I hope you're able to get it to work! For posterity, here are some makes I did in the last 24 hours using all the files I've uploaded.

The green on the left was from the incorrectly scaled original separate files, the middle is the updated separate files, and the right is the original combined file. I was able to screw the gold prints together, no problem. The green one, because it's smaller, a lower quality PLA, and because I printed it at .3mm with a .6mm nozzle, took some work to get on, but after some intentional TLC, was also able to screw on despite the smaller size and larger resolution.