screenshot text: “Jerk” is not a 3D printing community thing, that's the actual term in physics. It also extends beyond jerk to snap, crackle and pop. r Position dr/dt = r Velocity (speed) d²r/dt² = r Acceleration d³r/dt³ = r Jerk d⁴r/dt⁴ = r Snap (jounce) d⁵r/dt⁵ = r Crackle d⁶r/dt⁶ = r Pop In practice the stepper motors and controllers in the real world can't control on a fine enough level for anything beyond jerk to really matter.