Tightening xy joiners makes rails not smooth

Hi, After deciding to square my frame a realized that when I tighten xy joiners the x rail is not smooth anymore, can someone help me with some guidance about how to check what is wrong? Frame is square, all rails are new. Thanks!
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4 Replies
like-gold
like-gold8mo ago
I sanded down the metal xy joiners and the xy joiners printed parts where they screw together
foreign-sapphire
foreign-sapphire8mo ago
After fully assembly of X gantry - use flat surface to check bottoms of XY joiners, if not flat and parallel - sand them until they are (hold one side, put sand paper under another and move it back and fort, reverse, repeat) I would advise changing joiners to metal ones anyway
like-gold
like-gold8mo ago
good advice, thanks! will do now