# RepRap Config Page - what is Max. Speed ​​Change?

• Hallo zusammen, kann mir bitte jemand erklären, was bedeutet auf der RepRap konfigurationsseite im Register Motoren die Spalte Max. Speed Change (mm/s) und was ist der Unterschied zwischen dem und dem Acceleration (mm/s²)? Ich sehe aufgrund von Einheiten, dass das nicht das gleiche sein kann, aber eine maximale Geschwindigkeitsänderung ist miener Meinung nach die Beschleunigung, also verstehe ich irgendetwas hier falsch. Kann das bitte jemand mit anderen wörter erklären?
Gruß
Michael

Hello everyone, can someone please explain to me what the column Max. Speed ​​Change (mm / s) on the RepRap configuration page in the Motors tab means and what is the difference between the and the Acceleration (mm / s²)? I see from units that it can't be the same, but I think a maximum speed change is acceleration, so I misunderstand something here. Can someone please explain this in other words?
greeting
Michael

• ich will das verstehen, damit ich meinen Drucker voll ausreizen kann, maximal mögliche Geschwindigkeit, aber noch keine Schrittverluste. Durch probieren habe ich leider hier nicht verstanden, was sich ändert, deswegen die Frage. Kann das bitte jemand erklären, weiß es jemand?

I want to understand this so that I can fully use my printer, maximum possible speed, but no step losses yet. By trying, I unfortunately did not understand what is changing here, so the question. Can someone explain that, does anyone know?

• @Fasi I don't use the configuration tool but I'd guess that is the instantaneous speed change, commonly referred to as "jerk" in 3D printing. If you are not famiar with it, think of it as a speed change threshold. Typically, when doing small segmented moves such as curves, if there was no "jerk" setting, then every move would have to decelerate until the carriage stopped, then start the next move from zero speed. Very short moves would never reach the desired speed so the entire curve would print very slowly. When "jerk" is applied, the carriage would decelerate until it reaches the instantaneous speed change threshold (jerk value), then the next move would start at this speed, rather than slowing right down to zero between each move. The gcode for that is M566 and it's usually specified in mm/minute (not mm/sec). https://duet3d.dozuki.com/Wiki/Gcode#Section_M566_Set_allowable_instantaneous_speed_change

• I'd guess that is the instantaneous speed change, commonly referred to as "jerk" in 3D printing

Correct.

• @deckingman Oh, ok, now I understand. Thanks for the explanation!