Temperature

I stared printing with some different PLA filament today, and the print quality was terrible. The materials was not flowing well, jamming in the head causing thinning and breaking of the walls. At first I through that there was moisture in the filament as it was making a crackling sound when printing. However, increasing the temperature in attempt to drive out any water made the situation worst. After experimenting with a range of temperatures, reducing the temperature to 200° solved the problem. 

Although you would think increasing the temperature would make the plastic less viscous and therefore flow better, in some cases increasing the temperature can cause the plastic to start to depolymerise, causing it to thicken and jam the Print Head.