Nozzle remaining on print at the end of the print

[Baker807 0]

Please help.

Nozzle remains on print at the end of the print on and couple of seconds.

ultimaker 2 go

cura slicer

 

Thanks

[gr5 2,271]

Oh!  I saw this a year or 2 ago.  Haven't seen it for a while.  What version firmware on UM2go and what version of cura are you using?  I forget what causes this.

[Baker807 0]

Thanks for replying.

cura 4.6.1

firmware 3.3.0

 

[gr5 2,271]

One possible cause is if you mess with the flow.  Did you set the flow on your printer to anything other than 100%?  If so there is this bug in the Marlin firmware on the um2go - it's internally translating all the E values so it might get E1000 and if flow is 90% then ever since E was zero then it does E900 but if you changed flow part way through it has to do even more math.

 

At the very end it does a *relative* move I think in the gcode and it retracts.  But it gets confused and thinks it's at say E900 when it's really at E1000 and it retracts (or unretracts) like 100mm of filament.  Or it tries to.  And this takes a few seconds.  And it melts a big hold in the print.

 

[gr5 2,271]

If this is a new printer for you or if you updated the firmware in the last 6 months then you can try "reset to factory settings".  It fixes a whole ton of things when you do that but you will have to level the bed after.  Also if you adjusted the filament settings then those changes you made will get lost.  But "reset to factory settings" is pretty harmless other than that.  On many firmware installs you don't have a choice.

 

Also I recommend tinker firmware (which will also require a reset to factory settings after).  If you haven't been messing with extrusion rates/flow rates on your printer then that's probably your best next step:

https://github.com/TinkerGnome/Ultimaker2Marlin

 

I have tinkermarlin on all 3 of my um2go printers.

 

I don't use Cura 4.6 yet - I'm on 4.0 I think but it's not much different.  I strongly doubt a bug was introduced between 4.0 and 4.6.

[Baker807 0]

Thanks very much.

Will try.