Be specific, do you observe the machine to see the speeds not change, or do you inspect the gcode itself? I see slic3r has (optional)acceleration limitations, slic3r --help seems to imply --default-acceleration is 130mm/s^2 But when i run it without providing any settings and do --save it has default_acceleration=0 in it.
The machine itself also has acceleration limits on it. At 130mm/s^2 it takes and 120mm/s max speed it takes nearly a whole second to get up to speed, and a distance of at^2/2 = 55mm, i hardly believe that distance myself...
And there is --slowdown-below-layer-time for when a layer takes so little time the plastic stays too hot.
I am a noob too though, tbh i dont know what speed i am supposed to teach. (and have ooze issues)
