Yes, that belt is very loose, and likely to cause problems. Is the top section of that belt very tight, compared to the other belts? I fear that something may have broken in the sliding block to leave that much slack, but maybe it's just not very well positioned on the pulleys.
Use one of the little allen keys that came with the printer to loosen the grub screw in the front right pulley that the belt goes around. Then rotate the pulley a little to even up the tension between the two halves of the belt, then retighten the pulley.
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gr5 2,172
The holes are caused by "underextrusion" meaning less filament is coming out the nozzle than desired. You can probably hear the extruder stepper skipping backwards - if you watch it on these "bad" layers you can see and hear it skip suddenly backwards about 1/8 turn (but not forwards again).
The extruder stepper current is low enough so that it will slip backwards rather than grind the filament to dust. This is desirable as grinding to dust would have ruined your print.
The solution is to either slow down the print or raise the temperature. Raising the temperature of the nozzle makes the PLA flow more like honey instead of toothpaste.
For PLA I suggest temperatures from 210C to 240C. For speeds - it depends on layer thickness. 35mm/sec is nice and slow and a safe speed.
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