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Nozzle Switch Location
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Description

Is it possible to have the nozzles switch while over the prime tower IF the prime tower is activated that way any ooze can deposit on the tower as is moves rather than moving the other nozzle down over the part, depositing the ooze onto whatever was just printed.
Not having it do this makes the tower only good for priming the nozzle, not for preventing contamination.
If the Tower is inactive it would just switch normally. Ideally it would move to the new print location and then switch nozzles but I think it currently switches nozzles and THEN moves to the new location.

Event Timeline

anolen created this task.Mar 26 2019, 11:15 AM
alexei triaged this task as Normal priority.Apr 4 2019, 8:05 AM
alexei changed the edit policy from "All Users" to "Cura LulzBot Edition (Project)".
alexei assigned this task to victor_larchenko.
alexei added a subscriber: alexei.Apr 4 2019, 8:08 AM

@victor_larchenko , Could you please look at it?

@anolen @alexei Changed mechanics in both conditions, please test.

anolen added a comment.EditedApr 10 2019, 2:28 PM

@karrad, and @victor_larchenko, I have tested this CURA branch with 3 tazpro machines and 3 different materials.

There are a few unnecessary travel moves too and from the tower, but I have been unable to determine the exact movement pattern to request an edit and those moves do not hinder the print. That aside, the nozzle switching location is now GREAT! The active nozzle moves to the next area to be printed before switching, this allows the second nozzle to prime above its own color, decreasing contamination A TON! Thank you for this update!

@victor_larchenko , I merged it to master.

@anolen , please attach a picture or a video with "unnecessary travel moves" here, otherwise it will be hard to figure out what needs to be changed.

@anolen Are you still seeing unnecessary moves that you would like to get fixed?

karrad lowered the priority of this task from Normal to Low.Apr 22 2019, 2:43 PM

@victor_larchenko While awaiting an update here, we are going to lower priority.

karrad reassigned this task from victor_larchenko to anolen.Apr 22 2019, 2:44 PM
karrad added a subscriber: victor_larchenko.

Once you have an update, please post here.

There are some nozzle switching issues on the first 2 or so layers.

WITHOUT TOWER

VIDEO LOCATION: http://devel.alephobjects.com/lulzbot/test_documents/t_6357/first-few-layers.MOV

00:13 - T0 begins skirt
1:00 - T0 begins T0 part 1st layer
2:00 - Nozzles Switch to T1 over T0 print area
2:07 - T1 moves to print the T1 Skirt
2:55 - T1 moves to the T1 part area and begins to print
3:58 - T1 moves up in Z to print the T1 part 2nd layer
4:27 - Nozzles Switch to T0 over T1 print area
4:32 - T0 moves to T0 part and begins to print the 2nd layer
5:06 - T0 moves up in the Z to start T0's 3rd layer
5:27 - T0 moves over T1 part
Nozzle Switch to T1
5:33 - T1 begins to print T1's 3rd layer

Video End.

WITH TOWER

VIDEO LOCATION: http://devel.alephobjects.com/lulzbot/test_documents/t_6357/tower.MOV

Begin Video - T0 prints its skirt
00:40 - T0 moves to tower location to print the tower skirt
1:03 - T0 begins 1st layer of the Tower
1:41 - T0 moves to start T0 Part layer 1
2:44 - T0 moves to tower area then switches nozzles to T1
moves T1 over last part location printed for T0
moves T1 to begin part skirt
3:20 - T1 moves to start tower Skirt
3:32 - T1 moves to begin the 1st layer for T1's Part
4:37 - T1 moves up Z and begins 2nd layer
5:06 – T1 moves to Tower area
5:11 – Nozzle Switch to T0
T0 moves over last printed area for T1
T0 moves back to the tower and prints tower layer 2
5:21 – moves T0 to T0 part to print layer 2
5:52 – T0 moves to Tower to purge.
5:59 – T0 moves to T0 part to print the 3rd layer
6:22 – T0 moves to Tower area
Nozzle Switch to T1
T1 Purges on Tower
6:35 – T1 moves to T1 part to print…

Video End.

Here is a preferred order of movements:

WITHOUT TOWER

T0 begins skirt
T0 begins T0 part 1st layer
T0 moves to T1 skirt area
Nozzles Switch to T1 over the T1 skirt area

T1 prints the skirt
T1 moves to the T1 part area and begins to print
T1 moves up in Z to print the T1 part 2nd layer
T1 moves to where T0 will be starting its 2nd layer
Nozzles Switch to T0 over T0 print area

T0 begins to print the 2nd layer**
T0 moves up in the Z to start T0's 3rd layer
T0 moves over T1 print area
Nozzle Switch to T1
T1 begins to print T1's 3rd layer
Video End.

WITH TOWER

Begin Video - T0 prints its skirt
T0 moves to tower location to print the tower skirt
T0 begins 1st layer of the Tower
T0 moves to start T0 Part layer 1
T0 moves over T1 skirt area
Nozzle Switch to T1
T1 to begin part skirt

T1 moves to start tower Skirt
T1 moves to begin the 1st layer for T1's Part
T1 moves up Z and begins 2nd layer
T1 moves to Tower area
Nozzle Switch to T0 in tower area
T0 prints tower layer 2

T0 moves to T0 part area to print layer 2
T0 moves to Tower to purge.
T0 moves to T0 part to print the 3rd layer
T0 moves to Tower area
Nozzle Switch to T1
T1 Purges on Tower
T1 moves to T1 part to print…
Video End.