diff --git a/rrf2.x/sys/config.g b/rrf2.x/sys/config.g
index 003cd8c..6e20a68 100644
--- a/rrf2.x/sys/config.g
+++ b/rrf2.x/sys/config.g
@@ -42,7 +42,7 @@ M208 X-35:328.5 Y-49:243 Z0:300 C0:260 S0 		; Set axis maxima & minima
 M350 C8 I0 					; Configure microstepping without interpolation
 M350 X16 Y16 Z16 E16:16:16:16 I1					; Configure microstepping with interpolation
 M92 X100 Y100 Z1600 C100 E834:834:834:834		; Set steps per mm
-M566 X400 Y400 Z8 C2 E2:2:2:2				; Set maximum instantaneous speed changes (mm/min)
+M566 X400 Y400 Z40 C2 E2:2:2:2				; Set maximum instantaneous speed changes (mm/min)
 M203 X35000 Y35000 Z1200 C5000 E5000:5000:5000:5000	; Set maximum speeds (mm/min)
 M201 X6000 Y6000 Z400 C400 E2500:2500:2500:2500		; Set accelerations (mm/s^2)
 M906 X1800 Y1800 Z1330 C400 I30   ; Idle motion motors to 30%