<p>For anyone having the same issue I found out it was due to a Z axis motor lock up because the pulley attached to it would get stuck under the bed. I found out because I tried to print again and it locked up completely and I had to pull it out with pliers. Just finished an 18 hour print to confirm</p>

CC BY-SA 4.0
2019-01-08T19:50:27.833Z
2019-01-08T19:50:27.833Z
deshawnjones05
<p>Mid way through prints the print head will crash into the print, then crash into the bed, raise up about 3 inches, and start swinging back and forth over one part of the bed.</p>

<p>I have had successful prints with the same firmware, but this just started happening and I cannot wrap my head around why. The part of the bed it swings back and forth over is the same on every print. It also do not occur at any particular time, on some prints it will happen after the first few layers, on other it will happen mid way. </p>

<p>My printer is an anycubic kossel delta running marlin. I have tried re uploading marlin and switching slicer software. I have used mattercontrol, cura and ultimaker cura.</p>

<p>Thank you!</p>

CC BY-SA 3.0
2018-01-26T06:11:05.483Z
For anyone having the same issue I found out it was due to a Z axis motor lock up because the pully attached to it would get stuck under the bed. I found out because I tried to print again and it locked up completely and I had to pull it out with pliers. Just finished an 18 hour print to confirm.
deshawnjones05
CC BY-SA 4.0
2019-01-07T15:30:02.647Z
@deshawnjones05 could you stick that in as the answer?
BanksySan
CC BY-SA 3.0
2018-01-11T09:44:57.103Z
Fried PCB board, or at least some loose contact / power issues?
mac
CC BY-SA 3.0
2018-01-11T12:33:46.747Z
You should post a video to /r/printersgonewild ;-)
Doctor Jones
CC BY-SA 3.0
2018-01-11T15:31:36.980Z
I agree that it is likely to be a signal or power integrity issue, IMO most likely to be a problem with a ground connection.
cmm
<marlin><ultimaker-cura><delta>
Printer going wild mid print
deshawnjones05
# Printer going wild mid print

(Asked by: username_0 on 2018-01-11)

Mid way through prints the print head will crash into the print, then crash into the bed, raise up about 3 inches, and start swinging back and forth over one part of the bed.

I have had successful prints with the same firmware, but this just started happening and I cannot wrap my head around why. The part of the bed it swings back and forth over is the same on every print. It also do not occur at any particular time, on some prints it will happen after the first few layers, on other it will happen mid way.

My printer is an anycubic kossel delta running marlin. I have tried re uploading marlin and switching slicer software. I have used mattercontrol, cura and ultimaker cura.

Thank you!

**Tags:** marlin, ultimaker-cura, delta

> **Comments:**
> **username_2**: Fried PCB board, or at least some loose contact / power issues?  
> **username_3**: You should post a video to /r/printersgonewild ;-)  
> **username_4**: I agree that it is likely to be a signal or power integrity issue, IMO most likely to be a problem with a ground connection.  
> **username_0**: For anyone having the same issue I found out it was due to a Z axis motor lock up because the pully attached to it would get stuck under the bed. I found out because I tried to print again and it locked up completely and I had to pull it out with pliers. Just finished an 18 hour print to confirm.  
> **username_1**: @username_0 could you stick that in as the answer?  

---

## 1 answers

### Answer by username_0 on 2019-01-08. Score: 4

For anyone having the same issue I found out it was due to a Z axis motor lock up because the pulley attached to it would get stuck under the bed. I found out because I tried to print again and it locked up completely and I had to pull it out with pliers. Just finished an 18 hour print to confirm


---

