Filament refusing to feed.

[bigo93]

Are you sure that fan noise is from the PSU?

There is a small fan next to the motherboard, it is supposed to pass air over the heatsink in front of it, but apparently it does almost nothing to help.

So you can actually remove that fan.
Also because it is mounted to a short plank of frame, it can vibrate a lot!
I think this sound is actually that fan vibrating that frame.
Remove the fan or unplug it and see if the sound goes away.

[EagleSeven]

Are you sure that fan noise is from the PSU?

There is a small fan next to the motherboard, it is supposed to pass air over the heatsink in front of it, but apparently it does almost nothing to help.

So you can actually remove that fan.
Also because it is mounted to a short plank of frame, it can vibrate a lot!
I think this sound is actually that fan vibrating that frame.
Remove the fan or unplug it and see if the sound goes away.

Yes, I removed the very loud 40mm fan at Mobo and replaced it with a 120mm fan,
hung below the Mobo.
(used plastic tie-wraps to suspend there, since not much there to make a solid attachment,
after removing the plywood cover-plate, that is not needed)
Very quiet that way and larger fan cools Mobo better !

I also printed 4 shock-mount Feet, that raises printer up from table about 2 inches ,
which gives more space, for that 120mm replacement fan, under printer.
(file for Feet can be found at thingiverse.com)

Note: also added a removable Dust-Filter on Fan,
which the 40mm fan did Not have

[bigo93]

These feet? http://www.thingiverse.com/thing:916254

[EagleSeven]

These feet? http://www.thingiverse.com/thing:916254

The feet we printed are very similar to those but have more plastic at top
to hold them on printer better, when lifting up or moving printer.
And they used pipe-insulation for the spring, not many metal-springs.
(insulation can be purchased at hardware stores)

This is feet we printed with Black PLA to match printer color
and they work very well !
(Since we already had the pipe-insulation they were easy to assemble)
These will fit several different models and makes of printers

http://www.thingiverse.com/thing:691234

ctc feet.jpg