5/16" bolts fit (snugly) into some of the bolt holes in my parts (that I printed on my CR-10).
However for about half the holes the fit was tight enough that I needed to turn the bolts so they threaded their way into and through the holes.
And for a few holes I actually took a 5/16" drill and manually used it to make the holes bigger.
Is this common?
I have the 3D printer running in my living room, and my roommate has lots of windows open, so there is a fair amount of air flow (and changing amounts of humidity) during these long prints for the parts - could this explain why some holes are perfect, and some are a bit tight, and some are too tight?
I assume that if my printer wasn’t calibrated then all the holes would be wrong.