Ultimaker 3E Nozzle too close to build plate

[bkirchman 0]

Trying to do a basic print with my UM3E after the update to the latest firmware 5.2 I believe.  Not sure if it is a coincidence, but every time I print the nozzle is virtually scraping the plate.  I have tried autoleveling a few times with no errors and get the same result. I have manually leveled with the same result. I even tried manually leveling and purposefully putting the nozzle high (over a mm) and it still scrapes.  Is that a software issue? Potentially a sensor issue?

[bkirchman 0]

My firmware is the most up to date 5.2.11

[gr5 2,266]

When you did the manual leveling, did you also disable the autoleveling?  Or is it doing the autolevel before every print?

 

[Smithy 1,146]

Are you using any z offsets in your gcode or do you use any post processing plugins?

[gotty 0]

I'm having exactly the same problem.

 

I did a couple of prints this morning and decided to update the firmware. Now on 5.2.11.

To be on the safe side I did a single auto-level then went to print the same object (a very simple disc with two holes in it). It did its usual little pile absolutely fine - but then nothing. The nozzle was touching the glass plate and nothing was coming out (because the nozzle was being blocked by the plate).

I've tried several attempts at auto-levelling since, with the same effect.

Something is very wrong. 

I've also noticed that the progress bar on the base-heating and nozzle-heating doesn't work any more (although they're both heating up as expected).

Unfortunately, I don't know what the previous firmware version was, but I need to go back to it as a matter of urgency - is there a mechanism for reverting to my previous version?

This is on an Ultimaker 3.

Edited June 19, 2019 by gotty

[gr5 2,266]

Where you guys on 4.X before this?  Or where you on 5.1 before this?

 

The upgrade from 4.X to 5.X is a two step process where you have to update to a "stepping stone" version and then immediately update to 5.X.  You probably would have remembered that as you have to immediately do a second upgrade.

 

Some or all of the 5.X versions have a serious bug with the G92 command which, if you use G92, could cause what you explain.  But Cura does not normally use the G92 command for the Z axis so it shouldn't matter.  But many plugins use G92.  Such as pause at Z possibly and there is some kind of Z offset plugin that definitely uses it.

 

[gotty 0]

I haven't updated in a while, but it could easily have been 4.x

All I know is I used the update menu option on the printer. 

I also don't use any plugins.

[gr5 2,266]

Did you try a factory reset?  Often these "distance error issues" after an update are fixed with a factory reset.  At least with a UM2 this is true but I don't know about the UM3.  I don't even know if UM3 has factory reset.

[kmanstudios 1,120]

9 minutes ago, gr5 said:

I don't even know if UM3 has factory reset.

It does :)

 

[gr5 2,266]

@bkirchman - manual leveling 1mm above the glass won't help much if it does an autolevel right after.  Did you disable autolevel in addition to doing the manual leveling?

[gr5 2,266]

Okay - I heard from someone else that this bug is known and Factory Reset fixes the problem.

[kmanstudios 1,120]

36 minutes ago, gr5 said:

@bkirchman - manual leveling 1mm above the glass won't help much if it does an autolevel right after.

On a technicality, I would disagree about the manual leveling not helping.

 

In a broader sense, it is good to do a manual leveling periodically to correct for the buildplate 'settling' by way of many things. Basically, the more level the buildplate the less correction the active leveling process goes through.

[gr5 2,266]

Okay now I hear that "factory reset" does not fix the problem.  Instead it's recommended that you set autolevel to "never" and then do one more manual level and you should be good.  I only level a few times per year.  The leveling doesn't really change.  So once it's dialed in you are good for thousands of prints.