/diy/ - Do It Yourself

>leveling test prints perfectly
>begin printing actual thing
>brim prints perfectly
>it starts filling in the bottom layer
>suddenly extruder skipping intermittently as though the bed is too close to the nozzle, portions of the first layer look rough instead of smooth
>successive layers have gaps between some of the lines as though the bed is too far from the nozzle
>some lines just fail to print at all
What gives?
If the bed was in fact slightly too close to the nozzle, could that slight reduction in first layer height be enough to throw off all the successive layers? And what's with the lines that just didn't print at all? I checked and the extruder was still turning during those.

How could the bed be perfectly level in the corners, the sides, and the center, and yet be too close to the hot end in specific places around the center? I don't think it could've warped; it's one of those pretty thick glass beds. It's freshly cleaned, as well.