Relevant's of extrusion mult. settings.
Hello gang.
I am simple user of 3D printers and was use Simlify3D slicer before.
After MK3S+purchasing I am using Prusa slicer v2.5.
Have play with extrusion mult., in the filament settings, for correct flow rate, but do not saw any changes.
After few experiments I have check start G-code in the printer setting and find this line in the start code :
M221 S{if layer_height<0.075}100{else}95{endif}
I have original MK3S+ profile and do not understand why extrusion_multiplier does not useable in the start G-code and used constant 0.95?
Any ideas?
RE: Relevant's of extrusion mult. settings.
Extrusion multiplier and M221 flow are different things.
When you configure the extrusion multiplier it effects the extrusion calculations so every E value is altered slightly. For comparison slice a simple cube with an extrusion multiplier of 0.9 and another with the filaments extrusion multiplier set to 1.1. Then do a compare.
For the Em .9 for example
G1 F2700
G1 X113.539 Y116.461 E.69828
G1 X113.539 Y93.539 E.69828
G1 X136.461 Y93.539 E.69828
G1 X136.461 Y116.401 E.69646
for the Em 1.1
G1 F2700
G1 X113.539 Y116.461 E.85346
G1 X113.539 Y93.539 E.85346
G1 X136.461 Y93.539 E.85346
G1 X136.461 Y116.401 E.85122
Those 2 blocks are from identical sections of a test cube. Note the E values are very different.
So changing the filament extrusion multiplier DOES alter the amount of extruded material. The M221 is a firmware alteration to those values in the gcode file and is applied 'on the fly' as its printing by the printer itself.
The Default of M221 S95 is purely a prusa thing and something they added forever ago for their printers as it produced better results. What its compensating for is lost in the mists of time if it was ever known outside the company in the first place, and some of us remove that line from the start gcode anyway.
RE: Relevant's of extrusion mult. settings.
Thank U for explanation!