new roll of PLA here from Fry's today. Though I had some issues with it in the beginning, it took about 7x 20cm cubes printed before I found settings that worked right. I noticed it needed a little more heat than most PLA's do (this one i started at 180, and didnt clear up until about 210)
but all of my extrusion from the bottom of the print were fine up to about half way through the print. then the troubles seem to start. there are pockmarks and gaps in the part, and i'll attach pictures to show it, but you can see the bottom 100 layers or so are great, and then it starts to jam.
over the length of this print, i've noticed that there is a "grinding" noise in the extruder kind of like if you put peagravel in a sack and moved it around with your hand, which would almost always accompany the "thud thud thud" of a slipping extruder driver motor. The gravel noise is kind of new to me but the thuds arent.
here is a video on youtube showing what i'm talking about, hopefully someone here has had this issue. here are the pertinent settings from cura:
.25 layer height
wall thickness 2
infill 20% grid
printing temp 210, bed temp 70
1.75mm diameter, 100% (and then i adjust the flow on this to 87% in octoprint because it overextrudes)
retraction distance 1mm
retraction speed 150mm/sec
print speed 40mm/sec
youtube video here: https://www.youtube.com/watch?v=IbkY7VSWHj4