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That leadscrew should not be out of place like that, It could just be the nut holder under it is out of alignment.
Not sure what it could be. Are the 1.5″ bolts loose, they should be? If those are too tight you could be throwing it all out of wack. If the conduit fit in the front half there is no way the back half shouldn’t fit. You didn’t put the bearing spacers in there did you just bearings right? Tighten the 5″ bolt and it should take up the slack.
I know the parts are good I just built 2 more machines and they fit great. I checked all the pieces on 4 more sets I have printed and the only part that has some friction to the 5″ bolt is the XYZ plate all the rest slid through by hand.