I have a CTC Formaker 4 in 1 3D Printer. It has worked great for a long while but now it is messing up. It will print fine for awhile and then the filament will stop coming out but the printer keeps moving like it thinks it is still printing. If I clear the print job and start over, it again prints fine at first but then I get the same end results. Please help me fix this problem. I have not been able to find a solution on Google. Also I am using the latest version of MatterControl.