@deepshots:UM2 speed torture test but still the print quality is not what it used to be: More banding, more underextrusion (especially with thicker layers), not as accurate dimensions, etc.
Not accurate dimensions; Ill bet you need to tighte the drive belts, especially the small ones in the back. Loose belts cause "over-moving, or "backlash", printing out of domension.
Underextrusion; material in bowden tube from extuder drive, maladjusted drive or most likely buildup of carbon in hot end.
Fix: Atomic pulls, use another colour. Do it until the it comes out perfectly clean and in shape.
easy way of making atomic is inserting a piece of bowden tube maybe 10cm long into the head, then feed the atomic pull-filament through it. you can also use a tube 6mm outer dia, 3mm+ inner dia.
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visu-al 2
If i print wihtout heated bed on my um2, i use blue painters tape to print PLA. Or Kapton / Polyimid tape if i like to have a glossy surface..
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