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dmahalko

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  • 3D printer
    Ultimaker 3 (Ext)
  • Country
    US

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  1. An IT server admin person might want to know about this. Something went wrong with the Ultimaker website servers. I do not know what. I have not signed in here since about December, about four months ago. For some reason I could not sign in to these forums with my email address. I tried the password reset, and instead was told "account does not exist". ?? I just now went through and created a new Ultimaker account with the same email address, username, etc and the Ultimaker website accepted all that. I then came to these forums but it still said "Login" at the top.. ?? I then signed in with the new (replacement) account, and I get this message. I refresh the page, and then it lets me in, and here I am posting about it. So, are we all good now? Is the Ultimaker website done with being weird?
  2. I am slowly coming to the conclusion that the UM3E firmware is not properly maintaining the BB Core printhead temperature during the course of a long print job, and the cause of this is likely the heated printing plate, which at first heats the glass, but then continues on to radiantly heat all the other surfaces inside the UM3E body. I have decided that since the failures are repeatable, with the PVA burning at nearly the same spot each time, I will just keep trying the same project over and over until it succeeds, damn the waste of filament. I have been gradually turning down the heat to see what happens. Also I am using a PVA raft, and that has absolutely no problems whatsoever, looks clean, no faults. It's only right near the end where the printhead is getting to be too hot, the PVA chars, and plugs the printhead. Model source: https://www.thingiverse.com/thing:34277 "Deer Head detailed" by Takeshi Nov 11, 2012 Uniform scaling 36.51% PLA Green in AA 0.4 Natural PVA in BB 0.4 Profile: Fine 0.1mm Speed (default) 70mm/s Generate Support, using Extruder 2 Build plate adhesion: Raft Build plate adhesion Extruder: 2 Enable Prime Tower Wipe inactive nozzle on Prime Tower Ambient room temperature: 73 F / 22.7 C 1. Drop print temperature from 200C to 190C. No apparent effect. Prime tower contains small black blobs of PVA. Cleaning printhead BB hot push cleaning: lots of black charred gunk strings out 2. Staying at 190C, drop printhead standby temp from 100C to 80C. PVA gets further along before failing. Prime tower contains small black blobs of PVA. hot push cleaning: lots of black charred gunk strings out 3. Staying at 190C, drop printhead standby temp from 80C to 60C. PVA fails at about the same spot yet again though a little higher before it failed. Hot push cleaning: far less black charred gunk, it's now just a light brown and a tiny tip of black charring. The interior of the prime tower looks much better, and no more black PVA blobs. , So.. how low can I go for the printhead standby temp? I am going to try for 40C / 104F next. Can it be set to turn off completely? Also through all this I have not changed the print speed. Lowering the temperature has had no effect on PLA print quality for Fine mode. Once I bottom out the standby temp, I will probably start dropping the print temp to 185C and then 180C while maintaining Fine print speed to see what happens. , So anyway, it seems the PVA BB core is not maintaining correct temperature through the course of a print job, and eventually gets too hot and burns the PVA.. But the PVA works completely fine at the start of the job when the print bed has not had time to radiantly heat up the printhead assembly...
  3. Followup for anyone else looking for this.. after poking around a bit, it seems there is in fact a complete 147 megabyte STEP model of the UM3E lurking in the Github: https://github.com/Ultimaker/Ultimaker3Extended/blob/master/3D model Ultimaker 3 extended/9511.STEP.zip (FreeCAD was none too happy about opening this massive STEP file, but it did finally open after about 10 minutes of Not Responding. For my mockup modeling purposes I can delete about 80-90% of the internal, non-visible, or very small parts.)
  4. I am working on designing a nice looking, dust, moisture, fume, temperature stability environmental enclosure (planning to post about it separately) and would like a model to place inside it. Full model accuracy is not required, just the main body panels. Apparently those could be dug out of the github and manually assembled.
  5. Is there a source for a 3D model of the Ultimaker 3 Extended?
  6. This is basically our first ever use of PVA. Brand new roll of Ultimaker PVA straight out of the shrink-wrap, loaded this afternoon on an Ultimaker 3 Extended. ThingiVerse: Spiral Chess Set with hollow base https://www.thingiverse.com/thing:1264417 Printing the King piece, PLA with PVA support and raft. Results about 80% of the way, appear to be... not great. PVA "chunks" scattered all over the bed, falling off from ... somewhere. PVA filament blobs all around the object. PVA tail seen sticking out about 5mm from the extruder head while it is using the PLA. PVA extruder head is completely carbonized black.. it was new and unused about 5 hours ago.
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