<p>You are probably driving the motors with insufficient current. Try increasing the motor current, by adjusting the potentiometer on the respective stepper driver. Turn it clockwise until your motors stop skipping steps.</p>

CC BY-SA 3.0
2016-06-19T16:50:36.700Z
I've been playing with that... The Z-axis motors are running in parallel in this model, I think the A4988 isn't strong enough to torque two Nema 17's in parallel, but all this is rather foreign to me.
user2183
CC BY-SA 3.0
2016-06-19T22:41:00.283Z
I realize that the motors are wired in series, not parallel. Sorry for the confusion.
user2183
CC BY-SA 3.0
2016-06-19T07:47:00.810Z
2016-06-19T07:47:00.810Z
Tom van der Zanden
<p>I have an HE3D Prusa XI3 that I have assembled but the z axis motors aren't functioning properly, they will whine instead of turn. They will turn if I use Z babystepping or position changes but will not when doing a fast position changes or in normal use</p>

<prusa-i3>
HE3D Prusa Z-Axis Motor Error
user2183
# HE3D Prusa Z-Axis Motor Error

(Asked by: username_0 on 2016-06-17)

I have an HE3D Prusa XI3 that I have assembled but the z axis motors aren't functioning properly, they will whine instead of turn. They will turn if I use Z babystepping or position changes but will not when doing a fast position changes or in normal use

**Tags:** prusa-i3

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## 1 answers

### Answer by username_1 on 2016-06-19. Score: 2

You are probably driving the motors with insufficient current. Try increasing the motor current, by adjusting the potentiometer on the respective stepper driver. Turn it clockwise until your motors stop skipping steps.

> **Comments:**
> **username_0**: I've been playing with that... The Z-axis motors are running in parallel in this model, I think the A4988 isn't strong enough to torque two Nema 17's in parallel, but all this is rather foreign to me.  
> **username_0**: I realize that the motors are wired in series, not parallel. Sorry for the confusion.  

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