Well if looks better than my prints. Congrats on that much.
@NathanielStenzel how do your prints look like? 
I posted a link here, saw it was url shortened by google and had no preview and then posted a different post elsewhere and tagged you, @Max_Moors
@NathanielStenzel it doesn’t look that bad. I had worse on my previous printer
https://plus.google.com/photos/118270370108535951469/albums/6374855142458073969/6374855143616354434
@Max_Moors ah. Was that a partial jam or a bad temperature or both?
@NathanielStenzel I didn’t have a part cooling fan and I put the temperature at 220°C
@Max_Moors PLA or ABS? People would expect the part cooling fan for PLA but not ABS. 220 makes me think ABS.
@NathanielStenzel PLA
BTW. You posted twice again
@Max_Moors fixed. A part fan should make PLA look better and that seems like a high temp for PLA, but it seems more people are reporting recommended PLA temps that high. I have to scratch my head about that.
@NathanielStenzel yeah I know. On the box of the filament it said the printing temps for that specific PLA would be 220.
But the printer did not have a part cooling fan so I couldn’t do anything about it…
@Max_Moors well, if you are going to print a bunch of PLA, there are alot of part cooling shroud design files around.
@NathanielStenzel ohh yeah I know. I also adapted one because my printer is like a CTC replica so I did manage to create one 
used it until now (my ptfe tube burned down… Tried to print nylon with the printer. (Last time I powered on the printer)
Ooch. Burnout. I did that too when trying to compensate for extrusion problems that turned out to be a partial jam.
@NathanielStenzel yeah I turned the heat up to 260°C on a brass nozzle with the ptfe tube in it… I smelled burned plastic… I also think something else burned but not sure yet… I still have to find a ptfe tube for the printer.
If you don’t like this resonating sound I would recommend to change the motor with double shaft one and add vibration damper like Vextra Clean Damper or other ferromagnetic one or make rattle damper by yourself. This will not only make you motor silent but will also reduce ringing significantly. You hear the sound more loudly without a belt because the belt tend to reduce the vibration within the motor as they are playing the role of inertia load and suppress the resonance within the motor. And yes mid-band resonance is common in stepper motors.