Any other brand of PLA that can work with a MakerBot Replicator 5th Gen.? I have tried Faberdashery filaments, which come in awesome colors but had variable results (random extruded errors) despite being the same diameter, and melt at the same temperature as do the Makerbot filaments…
Current filament brands for PLA I am loving of late are Meltink3d and Excelvan. Both come in a variety of colors and I have not had any extrusion issues with them compared to most brands I have used in the past. Both brands are under $30 off of Amazon.
I would recommend purchasing dyna-purge to clean out your extruder: http://www.3dfuel.com/dyna-purge/. This stuff has worked great for me for clearing out old materials especially when going between brands or different types of filaments. Cold pulls don’t do much depending on the printer and since I have one printer with Teflon tubes I don’t like to retract filament to switch colors as the old filament can get stuck in the tubes and cause clogs.