Problem with the proper extrusion width
Theoretically, when you print a hollow single perimeter cube the perimeter width set to 0.45mm and no top layers , the average thickness of the four walls should ideally measure 0.45mm or a tad below. To gain the target width you should use the Extrusion multiplier parameter. However, in my case, when I get to the actual 0.45mm in the printed model, it results in heavy over-extrusion with everything else I print. For me, the best value is between 0.41-0.42mm. Note: my calipers are pretty much accurate to ±0.01mm (checked with calibration leafs).
What are you thoughts on this?
RE: Problem with the proper extrusion width
It may be sacrilegious to say this but as much as folks like to think 3D printing is precise science it's often more art than science. Sure, I would try to dial the extrusion multiplier in for new filament. But if whatever value of the extrusion multiplier results in walls of 0.42 or so instead of 0.45 but gives you great models, hey, more power to you.
RE: Problem with the proper extrusion width
I am aware of the engineering tolerances, but this behavior seems to be consistent with PrusaSlicer, i.e. it is a systematic error. Therefore it can and should be corrected. It is understandable that extrusion varies between different filaments depending both on its diameter and its hardness (because the softer the filament, deeper the extruder teeth bite into it, resulting in a lower extrusion per step) - but I am wondering whether the printing algorithm model regarding the referent extrusion thickness can be better tuned, in order to be consistent with itself.