[UM3 NOZZLE 2 always leveled too close to bed after active leveling]

After a long time of practice and waiting in vain for a FW update I downgraded to 4.3.3 today: Everything is fine again, my auto-leveling works again! Too bad I waited so long and lost so much wasted time.

 

I had the auto-leveling problems with the original Ultimaker print cores (both AA-0.4). Replacing the print cores and factory reset did not help. The XY calibration didn't work either, because the PLA of the Core-2 was not visible. Level-Switch Test worked without errors. I would say that also the inductive height sensor worked perfectly during calibration (by watch the spring screws), only the Z-value is not stored.

 

Note about the Ultimaker 3 firmware recovery work instructions:

• Olimex board cover: This is the board with the Ethernet connector.
• I couldn't find the status LED-Q LED-R and LED-T. But it doesn't matter, as the progress and completion of the recovery process is shown on the display.
• In general: it was a easy and quick process.

During the welcome setup with the 4.3.3 I found something else: My NFC sensor is not connected because I use two separate spool holders. But I think this cause is rather unlikely.

[UM3 NOZZLE 2 always leveled too close to bed after active leveling]

On 9/27/2019 at 8:20 PM, gr5 said:

There's 2 ways to fix this.

 

One is to just turn off leveling.  It's really a waste of your time as manual leveling is so simple and easy and you only have to do it when you swap out cores and usually not even then.

 

If the nozzle levels too close usually it's because the spring in the core is weaker versus the spring in the bed.  You need the core spring stronger because the leveling doesn't know you've hit the bed until it starts moving so if the core moves first then there is a problem.

 

So loosen those 3 springs by turning the 3 knobs about 5 or 10 turns CCW (as seen from below).  That might be too loose to level but try that first and do a manual level (mandatory if you move those screws that much) and then see if auto level is better after that.  Don't loosen them too much.

 

Another solution is to remove the "bad" core.  Remove that one screw in the clear plastic part, take the spring out and stretch it such that it is about 5mm longer.  Put it all back together and it will work great for another few years.

 

 

I tried both methods: I turned the bed to a higher position and stretched the spring in my core. No change at all 😕

Further I changed cores right to left and left to right. The problem remains the same:  With auto-level the right core gets to low.

Could there be a problem with the firmware 5.2.11.20190503 on the Ultimaker 3 Extended?

Now I switched back to Manual Leveling.

One point can't be solved with manual leveling: During the XY calibration the right head prints hardly visible.

[UM3 NOZZLE 2 always leveled too close to bed after active leveling]

I have exactly the same problem. I use frequency "weekly".

 

Now I did the manual leveling and set the frequency to "never". I think this issue started with the last Firmware-Update. Before I only did the manual leveling only once, when I unpacked my the Ultimaker 3 extended.

 

I print quite a lot and use since 2 years the same two extruder. Could it be a issue with the extruder?

The print bed level sensor reports "Signal good".