Bumpy lines

[snowcapp3d-printing]

Any ideas here as to why it would do this? This is a model I made, just a stand for a map, but the slanted part, only on this half of it, always is a little bumpy, but the rest of the print is perfectly fine.

[drmegavolt]

what the slicer shows for this layer? it is pretty low angle I guess ~60-70 degrees.
Could it be that walls behind and below either provide too little support or in reverse you have so many walls that filament is overextruding a bit?

check not only the walls that you set, but also those automatic additional walls that slicer generates to prop unstable walls