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Sounds like under extrusion. Can be the tension on the extruder stepper pinch wheels, wrong temp setting for the plastic, but more likely just a clogged tip. If this is a Teflon lined extruder throat, then the Teflon could be damaged causing extra resistance/ friction.
If you recently swapped types of plastic, did you purge the one completely out at its temp with the replacement? (I.e. switch from ABS to PLA you purge with the PLA at 235 until the color of the PLA coming out shows no signs of the ABS and then drop the temp to 220. )