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First Layer calibration much higher on left  

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Syd
 Syd
(@syd)
Eminent Member
First Layer calibration much higher on left

Need help on this new issue: in any pre-print self-test, and the first layer calibration test (video), the sensor seems to calibrate to a much higher setting on the left than the right. 

Background: New to 3D printing.  Have 8 prints on the mini in the last week, and have been (mostly) happy. 

So far, I have had/resolved:

MINDA factory mounting height problem: https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/distance-m-i-n-d-a-probe-to-nozzle-tip/

"Heating Failed F1" problem: https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/new-mini-heating-failed-e1/

 

Posted : 26/12/2019 11:11 pm
Nick Danger
(@nick-danger)
Active Member
RE: First Layer calibration much higher on left

Hi Syd, I had the exact same problem with mine after a few prints.
The MINDA sensor (yellow tipped inductive probe) had faulty wires which has the issue when the print head moves out to the left.

This was more obvious when I removed the zip tie just above the print head and I found that the mesh leveling routine was having issue over the whole print bend (where previously it was just the left side like yours). So this helped confirm that the sensor was the issue.

Note there are a few other posts related to first layer issues and some have found that their z axis wasn't close enough to 90 degrees to the build plate and adjusting this by shimming the z-axis fixed their issue. So it might also be good to look into that. But I think if you remove the zip tie and the mesh leveling is worse then it's a good indication you need a new MINDA sensor from Prusa.

I talked with the Prusa support and they sent me a new Minda sensor. I just installed mine today and it's back working again.
Here is what mine looked like when it was having the problem.

 

Posted : 27/12/2019 8:51 pm
Syd
 Syd
(@syd)
Eminent Member
Topic starter answered:
RE:

Thanks @dewolla.  I contacted support a week ago and they agreed.  I am still waiting for the part.  Will post when I confirm that it worked. 🙂 

 

This post was modified 2 years ago by Official Prusa CS
Posted : 03/01/2020 4:30 pm
jim.n2
(@jim-n2)
New Member
RE: First Layer calibration much higher on left

Same issue just popped up for me after an 11 hour print.   Mesh bed level just starting failing on the left side of the printer, leading to screwed up auto level.

Looks exactly the same as dewolla video.  Request in with Support for a replacement part.

Posted : 05/01/2020 5:44 pm
Syd
 Syd
(@syd)
Eminent Member
Topic starter answered:
RE: First Layer calibration much higher on left

Update: Still waiting for the replacement probe, I got impatient so I replaced the probe wire (cut, soldered, heatshrinked) all but a couple inches on either end.   It  worked!  About 10 hours of nice clean prints so far.

Seems crazy that a zip tie could crush a wire this way!  Mentioned in another thread but I'm probably going to try something like this: https://www.thingiverse.com/thing:4082541

Posted : 07/01/2020 7:04 pm
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