Here's how I solved my thin line issue:
I had thin, detached lines a few nights ago using Ultimaker blue PLA filament. Not just the 1st layer. Every layer had clearly aligned and unified gaps between the lines, the end points weren't all touching the walls and the walls were all separating. Had a few days of printing white ABS from iMakr.com with no issues whatsoever, so this seemed completely out of nowhere. Was like the hole in my hot end was clogged a little bit, only letting 1/2 the normal amount out. So I cleaned out the head and poked a .4mm needle through the opening and that did nothing. Same result. I upped the material flow under the tune menu as high as 350% with NO change. (later found the http://support.3dverkstan.se/article/23-a-visual-ultimaker-troubleshooting-guide#underextrusion that explains how upping the material flow is not going to do anything)
I then remembered that I had upped the width of my material settings on the U2 a few weeks ago to 2.92 to match some new filament. I checked the width of the blue PLA filament and it was just shy of 2.85mm. Changing the material width on the U2 back to 2.85 solved my issue completely. The blue PLA is now printing wide enough to touch each other on flat areas and the separating wall issue is gone as well. bed: 60c, hotend: 210c, speed: 25mm~30mm, layer height: .08mm.
If your material setting is wider than the filament, you will get thin, detached lines. If it is set thinner than the filament, you will get over-extruded lines.
Hope this helps!
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pm_dude 27
http://umforum.ultimaker.com/index.php?/topic/5442-feature-request-allow-to-turn-off-fan-behind-extruder/?p=48288
Their shipping is pretty expensive so I ordered three. Want me to send you one instead? I can put it in the mail tomorrow.
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