Default PLA settings?

[UKIan]

For the first time since getting Simplify I've had to print with PLA. I selected the Auto-Configure for PLA and it defaults the extrusion multiplier to 0.90. I hadn't noticed until after printing, and, as with most prints from Simplify it came out rather well. So what's the reasoning behind reducing the extrusion multiplier for PLA?

[UKIan]

Bump... No one know what causes the default for PLA extruder multiplier to be 0.9?

Thanks

[jimc]

really the multiplier and filament dia go hand in hand. there is no right multiplier. its just a fine tune of the diameter you have set. if i had my filament dia set to 1.75 and the dia of the filament actually dropped to 1.74 then i might move that multiplier up from .9 to 1.02, etc. with all that said though there is a difference from plastic to plastic in the die swell of the material when its extruded which is why from a "standard setting" there is probably different multipliers for different materials.

[UKIan]

Seems reasonable, I sort of assumed it was something like that, but it wasn't obvious. It has been ages since I printed in PLA so I honestly couldn't remember what I would of used at the time. It predated me using Simplify anyway.