by TonyUFN » 25 Mar 2015, 14:41
I went through the same issues for a short while after building mine.
I saw print failures left and right and started cussing over the extruder design. But then I noticed the fan would not start at all.
What I started to notice was that the fan just simply would not spin up. With some help maybe, but it would eventually quit mid-print.
I ended up replacing my fan with a new one and it(the fan) has been running fine ever since.
Since you have already replaced yours, I cannot help any further other than to suggest you trace your connections all the way back to the mainboard.