Because of my graduation design problem, I was first exposed to 3D printing, and I didn’t quite understand the relationship between printing speed and extrusion speed, so I wanted to ask, how can I know the extrusion speed through the printing speed, or directly control the extrusion speed?

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The extrusion speed cannot be controlled.
The printing speed is the speed at which the print head moves, including the movement in the XYZ axis direction, including the speed of printing and idling.
The extrusion speed is determined by the thickness of each molding line after slicing and whether it is extruded or not. That is to say, the 3D printer will control the extrusion according to the G code. It cannot be changed artificially. If it is changed, it will be easier to roll over. If there is a problem with the extrusion , This speed is the most unnecessary factor to consider. Even if the printing effect is really poor due to the extrusion speed, it is also a problem with the slicing software, just change the software.
The so-called extrusion volume only reduces the extrusion speed by the corresponding proportion as a whole, and it cannot be regarded as a control over the extrusion speed.