billyd wrote:ps I typically print something like a 20mm square about 3mm high with about 20% infill and 4 layers top and bottom. I adjust my extruder steps/mm until my top surface is perfectly smooth with no gaps. I leave extrusion multiplier at 1 for all prints. Make sure you measure your filament diameter exactly and get all other information controlling plastic flow volume correct. After you do this your prints will always be perfect as long as you measure filament diameter accurately for each spool.
pss if the outer measurements of the cube are wrong your printer's x y or z steps/mm might have to be tweaked (assuming your plastic flow is perfect). It also could mean you are printing too fast or with too much acceleration.
Thanks. Here is my 20mm test cube with my multiplier set back to the default 0.9
As you can see, the top layer isn't perfect in the top left and bottom right corners of the face. The corners also seem to be a little bit bulbous. As for the dimensions, X=20mm and Y = 19.85mm. Acceleration is down to 200mm/s
Only some of my filaments seem to under extrude, so I can I get away with just adjusting the multiplier or do I have to change the steps each time?