RE: MMU3/MK4 Wipe tower issues(too much purged)
This is a noble effort and you did a lot of work to find a good solution.
My situation occurs when everything is normal and the filament misfeeds or has some other issue during change. While the printer is waiting for me to realize that I need to fix it and waiting for me to fix it, filament oozes out onto the tower. Now, an otherwise well formed tower has a glob on it which causes a collision and destroys the print.
My thought is that the nozzle should always park elsewhere during filament swap.
Perhaps there is a better thread for my issue?
Thank you.
RE: MMU3/MK4 Wipe tower issues(too much purged)
Hello,
I was having "blob on wipe tower" issues and tower crashes also. I did everything shown in this post - settings for tool change parameters and I set all filaments to same temperature. WOW! Finally got a great print. I will keep these parameters as my new default. Thank you very much.
RE:
Hi, having the same issue for some weeks now. The blobs are running me crazy. I had a chat with Prusa support 2 times. The first one was great. I set down purge extra flow from 250% to 150% and disabled purigng in infill. This makes a mess of much more waste but I was able to atleast finish a print. Sadly after the second print my problems were back...
Since I want to use purging in infill, I tried a print with 150% purge extra flow and 10 degree cooler filament settings. But this ended pretty early to.
I'll check the setting that were mentioned here, but I don't think that will make a distance. On 2 colour prints there is no problem even with 48h print time. But this model makes me crazy. I never had these problems with MMU2S+...
RE: MMU3/MK4 Wipe tower issues(too much purged)
Did you use same temperature for all filaments?
RE: MMU3/MK4 Wipe tower issues(too much purged)
I did. Effectively the color change is only between red and blue. These two are the same brand, same type of filament but other colors. I used the original profiles for Generic PETG, the settings are like mentioned in this thread.
RE: MMU3/MK4 Wipe tower issues(too much purged)
The whole idea of an MMU is to have multiple materials with different temperatures and characteristics. Changing temperatures between materials must never be an issue. If it is, then your design or implementation is flawed. The fact that the nozzle parks over the tower and oozes during troubleshooting is very troubling to me and needs to be addressed.
RE:
So, it was a busy day.
Someone on Reddit told me, i should check my slicer settings, especially the Filament -> Toolchange parameters.
Well, all the values there were wrong...
Created new Filament profiles from the Generic PLA and now it works flawlessly.
It wasn't the material, it wasn't the hardware, it was purely the slicer and me, because i used an old profile.
All the filament tips are now perfect 10/10. No blobs, no weird behavior, no stringy tips.
I second this. I switched to "Generic PLA" and had no troubles whatsoever in 1 small (2 color 64 tool changes) and 1 bigger print (5 Colors 332 tool changes).
I guess the issue is due to the fact, that my old custom profiles had the purge volume multiplier at 100% and additionally there were some options missing:
Thanks for the hint @markg-2