3D printing over extrusion is one form of inconsistent extrusion (the other being under extrusion). Here’s information on over extrusion:

Too much plastic is coming out of the nozzle. You will be able to see this on your print (if not when coming out of the nozzle) the lines will be thick, uneven and ‘blobby’ in areas.

Over extrusion is when the printer is extruding too much plastic through the nozzle. This can happen because of a few settings being slightly off but read below for how to fix it.

Recalibrate the steps/mm value of your extruder to ensure your extruder delivers the proper amount of filament requested. Once the steps per mm are set correctly, the next step to a proper calibration is to set your extrusion multiplier (also called feed rate) properly to combat over extrusion 3D printing.

Both steps/mm as well as extrusion multipliers are filament dependent and might even change over time. Or it could simply be a matter of you changing the extrusion multiplier for a recent print and forgot to reset it in your slicer.

Temperature can play a factor in 3D printing over extrusion, so as always ensure you’re printing at the cooler end of the spectrum for your material.

Source: https://www.3dsourced.com/rigid-ink/ultimate-3d-printing-troubleshooting-guide