Flow rate and extrusion multiplier calibration
Print a single-wall cube, measure it, do the arithmetic. Ten minutes for a permanent improvement.
Category: Calibration
The procedures that stop problems coming back: Z offset, flow rate, pressure advance, input shaper and bed levelling. Run in the right order, each one takes minutes.
Z offset: dialling in first layer squish
Print a test patch and read the lines. The paper trick is not precise enough for a 0.2 mm layer.