Day 3 of assembling the Prusa Core One kit... this thing isn't as well designed as I was expecting. It makes heavy use of machine screws going directly into PCCF parts, with no threaded inserts or even pre-cut threads. Machine screws simply aren't meant to be self-tapping screws and their tiny threads make these joints weaker than they could be. Some people in the comments of the assembly instructions have complained about these holes being too loose or too tight, their printer farm machines making these parts don't need to be far off for these holes to be too big or too small.