3DPrinting
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Sounds like your infill is curling up? Solid or sparse infill? If solid, it's likely over extrusion as you said. If sparse, my suspicion is temperature and/or cooling related.
Well. I'm not sure I fully understand it. The way I calibrated e steps was to tell it to extrude 100mm of filament and then measures how much filament was pushed through the nozzle. This resulted in a value of about 680 steps/mm.
This always overextrudes and setting it down to 640 steps/mm made it much better.
Setting flow rate in the slicer does not seem to have the same effect.
Lowering e-steps gave the result I wanted but with a lower value than was calibrated for.
Esteps and extrusion multiplier are related, but different, solutions to a similar problem. Changing one value by say 10% should be the same as changing the other by 10%.
Esteps is "how far does the extruder motor have to turn to extrude some length of filament". This lets your slicer know how much plastic volume should be extruded per step of your extruder motor
Flow rate is "crap, different filaments expand/contract at different rates and have different physical characteristics like viscosity".
This is why the extrusion multiplier setting is associated to your filament profile in PrusaSlicer and all its derivatives. I use a much lower value for ASA (around 0.88 if going slower and cooler) than PETG (0.95 ish) than PLA (1.0) than TPU (1.15 if memory serves).
I'll also tweak my extrusion multiplier depending on how I'm printing. For example, right now I have an ASA print going. The printer is laying down filament at 30 mm^3/s. To do this I'm printing a bit hotter than I normally would with this filament (245 vs 230). I'm also at 0.92 EM vs my usual 0.88.