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splitsecond

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Everything posted by splitsecond

  1. OK ... so weirdly only now after spending a couple of hours working on this and looking online for help I found https://ultimakernasupport.zendesk.com/hc/en-us/articles/115004793743-Printhead-Parts-Ultimaker-2-#PTFE Coupler ...and those instructions made me realize the two little screws on the fan heat sink were not to protect the plastic fan from being crushed (which from crushing the fan which I thought odd anyway). I took them out and screwed them through the alu plate they were previously butting up against and I think the problem is solved. Sorry for not seeing it sooner. I haven't tested the printer yet but am just about to. I just wanted to save anyone the trouble of explaining it to me.
  2. I recently received a defective Ultimaker 2+ from a friend. I figured out the temperature sensor needed to be replaced and that fixed the main problem BUT I cannot figure out why I can't reassemble the nozzle part of the print head. I'm not sure if I lost a piece or I just don't understand the design intent. When I tighten the 4 long screws that hold the print head together, the nozzle assembly (nozzle, Olsson block, the multi-holed metal "isolator nut" (at least according to this page (https://ultimakernasupport.zendesk.com/hc/en-us/articles/115004172206-Printhead-Diagram-Ultimaker-2-) , white plastic space, aluminum tube spacer the "TFM Coupler"?) is free to move vertically up and down. I tightened the isolator nut but the nozzle assembly is not at all fixed. See video below. The nozzle is removed but I don't think that is the problem. I searched all over for other pictures of the 2+ print head assembly and even downloaded the 3d model from Ultimaker but just can't see how to fix this. I see in other people's pics those 4 long screws extend more through the bottom plate but in mine two screws prevent that from happening. I imagine the final solution should provide a path for the filament that doesn't have any chance for it to bulge or melt outward (like a gap between any cylindrical component in the nozzle-isolator-white plastic-TFM coupler stack) but I'm not sure if the design really did it that way or not.
  3. I didn't do it yet as I have other things going on but I will try it.
  4. ok, thanks for the thoughts. I will keep testing things and if I succeed will post a pic.'n params.
  5. Here is the melted top of the head figure mentioned in the previous post: same print slightly different light angle to bring out different details In the meantime I got a somewhat better result (just printing top of head since the rest of the model prints fine and I don't want to waste time and plastic). Some settings: Ultimaker Original print in PLA Layer height: 0.25mm (I'll do 0.1 or 0.15 for final version after fixing issues, but for sake of speed in testing, 0.25) Wall thickness: 0.6mm (nozzle diameter) Spiralize Smooth Spiralized Contours Speed 90mm/sec. Temp: 214°C Adaptive max. variation: 0.27mm Adaptive step size: 0.03mm Adaptive layer threshold: 200 It's almost usuable, at least there's no hole. I'm not sure what to tweak next to get rid of the peaks and valleys. Maybe reduce extruder temp at that z-height. Below was the first attempt, for reference. Just spiralize, no adaptive layer height. I think the layer height was 0.15mm and the overall height 120mm, that hole about 30x38mm.
  6. hi, The adaptive layers functionality almost perfectly solves a problem I had...but not quite. I am printing a (bald) head figure and so the top is basically like the top of a sphere. I am printing 0% infill and spiralized so if I don't use adaptive layers the only way the top part of the head will come out as a solid surface would be to print the entire thing at a tiny tiny layer height (there are holes/gaps between lines of filament near the top of the head). I tried printing without spiralizing with a one-nozzle-width wide wall and and a top thickness of a mm or so but that's ugly as the light coming through the model shows the internal structure which I absolutely don't want. Anyway: adaptive layers would actually fix this problem except when I printed it the top of the head melts. The layers are apparently very thin and the plastic keeps getting run over by the hot print head. Any suggestions on how to fix? If there were a post-processing g-code extension to make minimum layer time much greater the last few vertical mm's of the print that might work but I don't find such a thing. Is there? I haven't tried changing the extruder temp with ChangeAtZ v5.1.1 ....maybe that'd work but I kind of doubt it. Underextrusion? Something else? I saw this https://community.ultimaker.com/topic/10953-top-of-print-melting and haven't tried it yet. I'm playing around with the parameters in Adaptive Layer Height now but wanted to reach out and see if anyone had a similar problem and maybe a solution or suggestion.
  7. I have exactly the same problem--very frustrating. I thought maybe it was some new 'feature' and spent a lot of time trying to figure it out but it looks like it is indeed a bug. I hope the fix version comes out soon since 3.6 is only usable for single objects as is.
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