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Preliminary Purge Strip Question  

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gnat
 gnat
(@gnat)
Noble Member
RE: Preliminary Purge Strip Question
Posted by: @tim-m30

So - folks are thinking the printer homing, doing them mesh level, then extruding in place prior to the purge line is expected behavior?

Sort of, yes.

It bed levels, goes to the start point of the purge line, and then issues the first tool change. The last step feeds the filament through the MMU to the extruder and this is where I believe the blob is being created.

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Posted : 19/10/2019 7:10 pm
bobstro
(@bobstro)
Illustrious Member
RE: Preliminary Purge Strip Question
Posted by: @tim-m30

So - folks are thinking the printer homing, doing them mesh level, then extruding in place prior to the purge line is expected behavior?

If the startup gcode instructs the printer to do so, absolutely. This is nothing new. Putting some sort of blob or scraping action in startup gcode goes back years. Chris Warkocki likes to put a big (8mm IIRC) blob at the start of his prime line and looks much like OP's. I use 2mm.

My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 19/10/2019 7:20 pm
bobstro
(@bobstro)
Illustrious Member
RE: Preliminary Purge Strip Question
Posted by: @gnat
It bed levels, goes to the start point of the purge line, and then issues the first tool change. The last step feeds the filament through the MMU to the extruder and this is where I believe the blob is being created.

I've watched the video a few times and it's as if the camera was positioned to give ambiguous info. I can't detect whether the extruder turns during the noisy bit (though I'm willing to bet it is) and I also can't make out whether an MMU is in use.

Watch the filament squirting up at the 20 second mark in the video and listen to the extruder furiously clicking. There's no way ooze is going to push up past the nozzle and form that blob, nor is oozing going to make noises.

My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 19/10/2019 7:26 pm
andy.j3
(@andy-j3)
Active Member
Topic starter answered:
RE: Preliminary Purge Strip Question

@tim-m30

I have gotten different purges but 99% they are the same. I suspect the different one might have come when i was swapping filament before the print started or something. im not sure why it changed tbh...

Posted : 21/10/2019 3:48 pm
andy.j3
(@andy-j3)
Active Member
Topic starter answered:
RE: Preliminary Purge Strip Question

Posted : 21/10/2019 3:50 pm
andy.j3
(@andy-j3)
Active Member
Topic starter answered:
RE: Preliminary Purge Strip Question

ZipOfBenchy

Posted : 21/10/2019 5:09 pm
andy.j3
(@andy-j3)
Active Member
Topic starter answered:
RE: Preliminary Purge Strip Question

@bobstro

Posted : 21/10/2019 5:11 pm
Felix
(@felix)
Eminent Member
RE: Preliminary Purge Strip Question

The purge strip starts at my left and goes right and back to start position before printing. It does very well and I think that the new longer strip with the blob make all old filaments struck on nozzle removing. The blob for me is like cleaning process if I forget to clean the nozzle. Everything well.

 

BUT I am asking you if I could change the travelling position for the x axis so it starts at opposite side? Because I want to get the PTFE tube more straighten, not bending to much makes the filament bent and misses PTFE sometimes during load to nozzle..


;go outside print area
G1 Y-3.0 F1000.0
G1 Z0.4 F1000.0
; select extruder
Tc
; purge line
G1 X55.0 F2000.0
G1 Z0.3 F1000.0
G92 E0.0
G1 X240.0 E25.0 F2200.0
G1 Y-2.0 F1000.0
G1 X55.0 E25 F1400.0
G1 Z0.20 F1000.0
G1 X5.0 E4.0 F1000.0

 

I think I would change those fat marks but the autohome will end up on the left side, not on the right side. How can I change autohome to right side?

My MMU2s is placed on my left upper above the printer.

This post was modified 2 years ago by Felix
Prusa MK3S MMU2S...
Posted : 30/01/2020 1:39 pm
Ken G.
(@ken-g)
Eminent Member
RE: Preliminary Purge Strip Question

I get a small blob at the start of the purge line, especially when I am switching filament types, PETG to PLA it is most noticeable.

Posted : 31/01/2020 11:14 pm
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