jdiebley

Greetings, After some discussion back and forth with others that were kind enough to walk me through possibilities of issues, it turns out that when you get the blobs at the end or the printer head buries itself just at the end of the print the printer profile(s) is corrupt! As a teacher teaching different grade levels and abilities, I often help students slice their objects. I had a few different profiles set up but switching between settings for nozzle heads, speeds, pause at height, etc must have cause some corruption. Once I deleted profiles and cleaned things up a bit the issue was resolved. I hope this works for you.. All the best, James

Thanks for the follow up. As I mentioned, today was the last day of school and I was slated to get an upgraded laptop so I didn't bother to download/install the latest version of Cura. I decided to purchase the computer and keep it as a second hand computer at home so I downloaded the newest Cura. I opened the profiles and deleted old ones and double checked settings. I printed a file that had the blobbing issue and it didn't happen on the print. I suspect it had to do with the printing profiles. Again, I have a bank of six Ultimaker 2+ printers that I print to using SD cards. Files are sent to me from my tech students and others that often require me to change the speed, density, nozzle settings, etc. I suspect I didn't discard a profile or something wasn't correct there. It appears to be fixed for now. Not sure what students if students had somehow messed with their printer profiles as well that was also causing the problems because periodically, I would print files from their laptops directly onto the SD card and into the printer. At any rate, I appreciate the prompt replies and at this point I will say case solved. If I have issues with this in the future I will know to discard profiles and set up new ones. Cheers! JD

Thanks for the quick reply. I suspect the gcode is somehow corrupted. I just viewed the gcode and I don't see the text listed above. When comparing successfully printed gcode files with non successful, there doesn't appear to be any noticeable difference (from a non-coding person). I suspected some of the misprints from students were coming from their settings errors from Cura. When it started happening to me I suspected maybe my changing profiles (I change nozzle settings, etc. for student prints) was causing it. Also, I notice that stl files exported out from Tinkercad are not especially good. I think the internal structure of the files are not so good comparing files from other programs like Fusion 360, etc. School is out today but I will investigate. I thought maybe it had something to do with multiplying the same object more than once. It was creating the blog on the last item of the print. I added an additional piece, and scaled it way down just so the printer would go to this 'dumby' piece and squirt the filament blob rather than on my desired piece. It actually squirted the blob on the last piece then went to the tiny dumby piece. Thanks in advance to all responders..

Experts, I am a middle school teacher having students use Tinkercad for their design, printing to Ultimaker 2+. In recent times, some students at the end of their prints have the printer bury the nozzle in the print, squirt out filament into a small blob. When this happens, the feeder also chews up the filament and it needs to be cut and re-threaded. This issue seems to be happening more and more frequently on three of my six printers. Things I have tried: updating printer firmware Re-exporting stl files from TinkerCad and re-slicing them Using new, reformated SD cards If anyone knows the answer to this question of what is causing this issue and how I can get it to stop, I would greatly appreciate this. Looking forward to the expert community chiming in. Cheers, James