wpullen

Hello, I have an issue I've noticed with my printer (Ultimaker S3, FW version 7.0.0), that at the end of some prints (I haven't paid attention enough to know if it's every print or just prints that have a small final layer, such as a pyramid or a sphere) the nozzle will park at the final print location for a small handful of seconds before moving off the print and end the session. I found a similar post about a similar phenomenon (see link below). My problem is nearly identical to what was mentioned in there, only without the additional extrusion. I just end up with a funny melted splotch at that last location due to the hot nozzle sitting there. Is there a setting I can tweak that I'm unaware of in Cura or a bug someone else has mentioned that I couldn't find, or a bug no one's paid enough attention to yet? This has been occurring since Cura 4.8, (so 4.9, 4.10 and now 4.11.0), and all the Ultimaker S3 firmware versions (don't remember the version number I started with early 2021) up until the current version, 7.0.0. Thanks for your help!

Bump. I thought I'd try out the ooze shield on my Ultimaker S3 since one of my materials tends to ooze while the other material is printing. I can't understand what other purpose the ooze shield would have except to prime the extruder so that there's no extra material as it's just about to print. I guess I can understand how some printers may have dual extrusion nozzles at the same height, but that's not the case for the S3, so the "hopefully the material oozing out of the inactive extruder while wipe off on the ooze shield" approach is not very significant. If the print order was reversed (i.e. switch extruder, print ooze shield with new extruder, then print layer with same extruder, switch and repeat), then the ooze shield would serve a dual purpose to both prime just before printing, and possibly catch hanging oozes. That way users can choose prime tower OR ooze shield, and my preference would be the shield in most cases I've come across so far. As an aside, it would also be very useful to allow prime tower or ooze shield for one material or the other, not tied to both, because some materials don't ooze so much and the priming may not be so necessary, while the other, dual extruder material might need it.

Update: Switched back to Cura 4.8 and the problem is indeed resolved and I can print with two extruders again! Thanks, @DrCeeVee, for your post on this, it saved my headache!

I echo DrCeeVee's problems on my Ultimaker S3. I have not tried the above solution yet (going back to Cura 4.8), but my problems are the same. I can print from only Extruder 1, or only Extruder 2 and they work perfectly. When printing with dual extrusion it turns out that the first extruder to start printing is the one that works while second one to start does not extrude anything. I was able to get the one not extruding to extrude by ramping the flow rate during print up to about 500-1000%, (not recommended since it takes forever to get the flow rate back down to a reasonable rate - I can see how doing this can quickly break the printer). I'm going to go back to Cura 4.8 and report back on the results.