Not a big deal- but my MK3 kit came with an injection molded two reel spool holder. I assume that is the new standard - looks like a "T". I never felt it was attached all that firmly to the frame, and on day two the lower lip broke off perhaps it was cracked prior impacting the fit, who knows. Looking at the part, it seems like a very thin wall in that area with no fillet.
So, time to improvise and print a new spool holder. As I said, no big deal. But I am curious if others have this same spool holder have experienced similar.