/diy/ - Do It Yourself

Anyone know what might be going wrong here?
This should be a solid rectangle 2 layers high (not counting the raft) with concentric fill. (There's more to the part than that but I stopped it after 2 layers because it was such a mess.) The surface is supposed to be smooth, but instead it's got this weird ripple pattern all over it, which is so bad in some places near the edges that the plastic is up a good 0.5mm in the air above the place where it's supposed to be.

>Printer make & model
Alunar M608
>Filament type/brand
Natural PLA, from MatterHackers
>Bed & extruder temperature
Bed: not heated
Extruder: 200C
>Print speed
40 mm/s

Layer height is 0.08mm, but I've seen the same problem from this printer at other heights too.
Non-concentric fill patterns show the same kind of ripples but don't lift up off the raft.