Cooling move after finished print
Hello,
i recently assembled my MK3S+ with the MMU2S attached.
After some problems (Wich is completely normal at the beginning 😀 ) I got all my filaments to work nicely when printing with multiple colors or with a single color. I set up the cooling parameters to get a well formed filament tip when changing colors and I successfully printed some multi color prints without errors while changing the filaments.
But there is one thing that is really annoying and I can't figure out how to fix it:
After the print is done (no matter if single or multiple color) when the printer wants to unload the filament, it gets stuck every time. And I saw that it wasn't making the right cooling move I set up, it doesn't make the right ramming sequence also. It just does the "standard cooling move", Wich isn't forming a good tip.
How can I get the printer to do my desired cooling move when unloading the filament ?
Thanks for your help.
RE: Cooling move after finished print
You could modify the custom gcode, end gcode. but I think you would have to spell out the changes rather than rely on the slicer configuration.
Or, Could you add an extruder change right at the end? ( I would try this myself, but I am 75 miles from my MMU2S) 🙁
Perhaps an
M702 C
could be used to unload the Current Filament
Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
RE: Cooling move after finished print
Thanks for the fast reply.
I took a quick look at a test .gcode and it looks like there is already a M702 C at the end of the print.
I will take a closer look at the .gcode to see what it does exactly after finishing the print.
RE: Cooling move after finished print
So i made a few test .gcodes to figure out how exactly the printer is doing the unloading sequence.
I figured out, that when you are using a wipe tower, the printer is doing the correct unloading sequence. When you are printing with a single color, the printer only does a standard unloading sequence, wich is specified here:
As you can see it does an if case to decide if there is a wipe tower or not.
Is there a setting or a gcode command to use the filament specific unloading sequence at this point ? Because if I just copy the unloading settings for my filaments and paste it there i need to change it every time i use a different filament.
Im curious because i cant imagine im the only one with such a problem 😀
Maybe someone found another solution to this problem
RE: Cooling move after finished print
there is also a Custom G code Setting in the Filament settings menu, so you could do your filament \specific changes there
Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
RE: Cooling move after finished print
Hi,
im facing the same issue right now. Did you found a solution regarding this topic? I would need to do at least one cooling move after my print ends. Otherwise the filament gets stuck every time.
Thanks in Advance 🙂
RE: Cooling move after finished print
Do you switch the printer off, directly after finishing a print, or do you let it cool with the hot end fan running until the extruder is below 50C, before switching off.
If you just switch off straight away, the heat in the extruder heat block, can rise into the heat break and cause heat creep blockages.
If you let the printer cool off this should not happen.
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
RE: Cooling move after finished print
Hi, thanks for the fast reply 🙂
I do not switch it off. This is the Standard action for the MK3.5 & MMU3 Prusa Printer Setup. The Extruder is running back and forwards a few times at the end of each Printfile. Then the filament gets pulled back by the MMU and stuck inside the extruder. This happens with single filament prints quite offen on my printer. If there is a wipe tower included in multi filament prints can control this topic via wipe lines.
RE: Cooling move after finished print
the purge tower doesn't always reach the height of the model, it stops at the layer where the last filament change occurred.
I am using MMU3 with mk3.9. if I have a single filament job, i use the multimaterial profile, and nominate which filament to use.
the slicer does not allocate a purge tower, because there are no filament changes,
at the end of the job, the printer goes to the naughty corner and poops in mid air as it completes the ramming process, then it unloads the filament back to the MMU
is that what you do?
Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
RE: Cooling move after finished print
Hi Joan,
yes exactly the last part you described. And either by the end of a job or canceling the print i am facing this issue. The filament can not be unloaded to the MMU.
I have to unscrew the extruder filament window and can see a folded piece of filament at the tip. It has almost a 60-90° angle and blocks itself.
I need to cut it, reassamble and then it works again.
Thats really annoing 😀
Do you have an idea how to fix this?
Simon
RE: Cooling move after finished print
Tbh no. Mine just works.
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK