Extruder not feeding correctly
My issue is that when I tell my extruder to feed 100mm from the manual control, it only feeds about 80mm. So consequently I an under-extruding on my prints. I marked on the filament 100, then I measured what was left. So how and where in the software/firmware do I tell the printer to print the correct amount of filament? and how do I figure out that value to enter?
Thanks in advance!!