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Bug: Prime blob way too big after aborted print (UM3E)

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Posted · Bug: Prime blob way too big after aborted print (UM3E)

Hi,

 

just found another bug that I would like to share with you.

 

Reproduction steps with Ultimaker 3 Extended connected via WIFI):

- Start print via Cura over Network
- While printing, pause print via Cura
- Abort print via Cura
- Clear build plate and select "NO" retry on printer panel
- Start another print via Cura over Network
Problem:
The printer makes a way too big prime blob that will cover the hole nozzle in filmament (about 4 times the size of a normal prime blob).
The extruder will mill into the filmament.

 

Would be great to get a fast fix for this issue. This is the 8th bug that we have seen on our Ultimaker 3 Extended within 3 month in occasionally usage.

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Posted · Bug: Prime blob way too big after aborted print (UM3E)
1 hour ago, macio said:

Hi,

 

just found another bug that I would like to share with you.

 

Reproduction steps with Ultimaker 3 Extended connected via WIFI):

- Start print via Cura over Network
- While printing, pause print via Cura
- Abort print via Cura
- Clear build plate and select "NO" retry on printer panel
- Start another print via Cura over Network
Problem:
The printer makes a way too big prime blob that will cover the hole nozzle in filmament (about 4 times the size of a normal prime blob).
The extruder will mill into the filmament.

 

Would be great to get a fast fix for this issue. This is the 8th bug that we have seen on our Ultimaker 3 Extended within 3 month in occasionally usage.

It would help to get the logs when this happens, using System -> Maintenance -> Diagnostics -> Dump logs to USB and send them either by using something like WeTransfer or attach them.

That way we can see which firmware is being used (missing in the report) and the state of the printer logic being used.

 

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Posted · Bug: Prime blob way too big after aborted print (UM3E)

Firmware version 4.2.5.20180102
Cura version 3.1.0

The printer is currently in use. Maybe I can download the logs tomorrow. 

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Posted · Bug: Prime blob way too big after aborted print (UM3E)

 

20 hours ago, macio said:

The printer is currently in use. Maybe I can download the logs tomorrow. 

 

That is fine, no rush.

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Posted · Bug: Prime blob way too big after aborted print (UM3E)

Update:

Problem is still reproducible.

It also occurred if we pause and abort the print directly on the printer and not only if we pause and abort the print via Cura.

The attached picture shows the big prime blob.

 

20180423_090408.jpg

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Posted · Bug: Prime blob way too big after aborted print (UM3E)

Update on this one. We've found the problem related to abort and too much or too little priming in the next print.

 

We're still working on the proper fix, as it's a complex interaction of motion being aborted while the rest of the system is continuing with movements to abort the print. All this causes filament positions to be out of sync and thus the large amount of priming later on.

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Posted · Bug: Prime blob way too big after aborted print (UM3E)

Great! Thanks for keeping us posted/updated @Daid ?

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Posted · Bug: Prime blob way too big after aborted print (UM3E)

@Daid
Just ran into the issue again yesterday. Are you still working on a fix?

 

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Posted · Bug: Prime blob way too big after aborted print (UM3E)

We are continuously improving the software of our printers and many stability improvements for the S5 will become available for the UM3 too. To our regret the last release for the UM3 has been delayed way more than anticipated.

 

The problem we are facing is that the S5 and UM3 are very similar, but differ in a few important ways. We are working hard to give the UM3 an update to the same code base as the S5, but we can only release this when we are absolutely sure the update process will never brick your machine. Tests have been going on for some time now, but new edge cases did pop up again-and-again.

 

We are working hard to release a new UM3 version, but I can't say anything about the timing. It will get there when we feel confident.

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