Continuous under extruding?

[Wally]

Here Goes
I have 2 2020 i3 printers for 2 years,for me their are Great printers,I am constantly tuning to get the best print possible, very impressed with what these machines can do, for the last month,i keep having under extruding
issue when the machine is first turned on and comes up to temp it will extrude exactly 100mm after it has ran a couple test prints it starts under extruding, if i start out at 105 Esteps I will go up to 130 Esteps ,run a couple 100 mm extrudes and I have to increase the Estep again, I have replaced the Nozzel (.4) i have replaced the Throat,I use the same brand ABS 1.75 230 C per manufacture, this morning I replaced the Driver,no difference with any of these attempts, I would appreciate and Helpful Comments.
Thank-you

[csorrows]

Have you tired cleaning the teeth on the extruder? Also check that there is still enough force on the idler in the extruder. Might be filament slipping.

[Wschmiedlin]

Did you ever resolve your issue? Finding that I had to change my Esteps to 220 in order to print correctly.