It will be beautiful IF I can ever get it together. This is an absolute pain in the ass to assemble. I will admit part of the frustration is definitely my fault for not noticing the nozzle for this 3mf is set to 0.4, but when I went back and reprinted parts with the correct nozzle I still am fighting the assembly. At this point I may just reprint it all and very slightly shrink the connecting walls but I also may just say to hell with it and throw it in the trash!
I intentionally made it a close fit so it wouldn't require glue. I used a small hammer to tap the piece together gently once they were aligned. everything went together fine. You could scale everything down .2 mm for tolerance as well. Sorry for your troubles.