Extruder problems...I think (1 reply)

I have recently completed a Prusa Mendel printer and am in the troubleshooting process. I recently added a piece of glass, as typical, above the heater bed, and now I am having issues with my extruder printing not in a solid line, but more in drops. I do not know if the two are related, but I was curious if anyone had any possible solutions to make the extruder print in a sold line once again.

It does print well if you apply pressure to the plastic feeding into the tip, so I thought it might be an issue with the motor/bearing combo not providing pressure or moving enough? Any help is appreciated!

Thanks!