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Fred804

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  • 3D printer
    Ultimaker 3
  • Country
    US
  • Industry
    Education

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  1. This thread was all from fall 2017, but in case anyone happens upon it, I figure I'll add my story. I was using dried PVA but got the same problem. I kept trying hot and cold pulls and reaming up the nozzle with a 0.4mm drill. Lightly using a 2.5mm drill from the top and the small drill from the bottom had me stymied how there was still a clog. I encountered no resistance on the drill through the extruder but could never print. I ended up disassembling the printcore (while waiting for a replacement printcore to arrive) and soaked the nozzle, by itself, in boiling water. After awhile, the small drill through the extruder was able to push the clog up and out of the extruder. My guess is that every time I tried reaming the nozzle previously, it was dislodging the clog up further into the assembly, only to be pushed back into being a clog when trying to print again. Of course, it's a very delicate thing as the section of barrel connecting the heater block to the heat sink is extremely thin, but it all worked, and I'd like to say that that printcore is working better than most of mine that are a few years old.
  2. While printing, I noticed a lack of extrusion and aborted the print, thinking it was a usual clog. However, I found that the print core on the right extruder leaked and filled the entire space between and under the the cores. I am hoping the only problem is the print cores, but I can't remove them. Can anyone help with suggestions? It looks to me like the leakage is contained by the cores, but I can't remove them even if I try to remove both at the same time since the plastic has fused them together. I am guessing that plastic between them must also be fused to the mount for the print cores.
  3. Does anyone have problems with the prime tower falling for tall prints like in the following Joel Telling (3D Printing Nerd) vid? Like in the vid, the Cura team has improved the prime tower default settings as it will now do a brim if the print is using one. However, I've still had problems with the tower falling. With a brim, the tower usually cracks off at the 2nd layer. I've tried increasing the size of the tower and am now printing 40mm towers, and I've increased the number of tower walls (by increasing Prime Tower Minimum Volume) to 4 (2 for nozzle 1 and 2 for nozzle 2), and it still falls (see attached photo of a print where I tried to salvage it by gluing the tower back onto the print bed -- the tower had cracked off after only having printed about 2 inches!). I could keep making the tower thicker, but it would be great to have a really thick wall at the bottom and have it gradually thin out towards the top. Or some other idea that would stop this problem. Thoughts?
  4. I upgraded from 3.5, but now I can't open Cura 3.6 no matter how long I wait. I tried reinstalling - no luck. I tried removing and reinstalling 3.5, but now I can't run that either. I then downgraded to 3.4.1, and that worked. I then tried reinstalling 3.6, but it still would not open. Now, I have to use a version (3.4.1) that is older than my orevious version (3.5). The worst part is that I did the upgrade only to stop the nagging message that comes up every time one opens up an obsolete version of Cura (there should be a way to disable that warning.
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