I uh... What? I printed the parts on the right at 0.1mm height and

I uh… What? I printed the parts on the right at 0.1mm height and they came out gloppy for various reasons. I tried again at 0.4mm and stopped after two layers. The results are on the left.

Both the brim and infill appear wavy with areas of high extrusion and areas with no extrusion at all. What is bizarre is the defined pattern. The rendered too paths look fine so I think this is an artifact in the extrusion amount itself.

Slic3r 1.0.0rc3, Prusa i3, 220c 0.5mm hotend, green abs, 110c glass bed on blue tape.

The wavy stuff is pressure building up and releasing due to the nozzle being too close to the platform.

The blobby stuff looks like insufficient cooling, over-extrusion, or possibly excessive “extra length on restart”.

@Whosa_whatsis , oh, ofcourse! I did just tighten a bolt on the x-carriage and didn’t consider its effect on alignment. I will know in 10 minutes if it worked.

I expect the gloop is related to cooling as well. (The pieces rock as the head passes over them.) These are part of a fan mount. I was not aware of length on restart, but I see it is set to 0.

@Whosa_whatsis , z alignment was the issue, thanks for the speedy resolution. Too bad I didn’t even finish the first layer before my printer seized. It looks like I’ll have to wait on new bearings after all…