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chhu79

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  • Field of Work
    Education
  • Country
    DE
  • 3D printer
    Ultimaker 3 Extended

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  1. Hi, we have a Ultimaker 3ex and I was trying out the breakaway, with cura 3.4 standard profile for PLA AA0.4 and breakaway AA0.4. First prints were stunning, but after there was a longer pause for the breakaway print head during a print, it converted to a brownish sticky goo that clogged the extruder. After immense cleaning efforts remainders always keep coming back and ruin the print and head. Two trashed heads already, so I'm not very happy. It reminds me of flex material on my Prusa MK3, when you exchange with ABS afterwards and brownish spots keep entering your print, like flex can hide in some pocket of your extruder. Interestingly the same happens if I choose PVA with BB0.4 and have the support infill printed by the other printhead. Always messes up my BB0.4 with burnt PVA. Am I missing something? Chris
  2. chhu79

    File size limit on STL files?

    Thanks! How did you decimate the mesh? I do intend to go for higher res, as the UM3 is able to print this kind of detail, but mesh reduction for smooth areas cannot hurt. I found that meshlab has poor options and introduces problems and Meshmixer only runs on windows... I suspect the problem is with Cura, as CuraEngine is pure C++ and should not be limited by file / mesh size. I do not see CuraEngine starting. Maybe a Cura developer can comment on that? The meshes come from a python script that combines a refined icosahedron mesh with a DEM GeoTiff. The dual coloring is a bit more complex. The stand is just combined mesh quickly sketched from openscad. The globes have an average radius of 1, that is why they are so small, but it allows for accurate scales. Put it on 6750% (67.5cm) and you have an 1:1.000.000 Earth.
  3. chhu79

    File size limit on STL files?

    Actually I just found out that it fails to slice c1_stand on itself. I don't know why, mesh is clean, no holes or anything...
  4. chhu79

    File size limit on STL files?

    Win7x64 and Linux 64bit. RHEL7. Cura 64bit as well. Links here: http://www.respawned.com/c1_stand.stl http://www.respawned.com/c2_surface.stl Surface mesh is not clean, but lower res works and is also not clean...
  5. Just tried to slice a dual color print and cura 3.1 gets stuck on Slice... (disabled auto-slice, hit Prepare button), nothing happens anymore. I use Linux RHEL7, The STL files are 1.1GB / 560MB. Windows version tells me invalid files, Linux opens everything just fine but I noticed that I cannot save anything (leads to zero-files). I hope there is no limit in place? My machine has plenty of RAM and the console output says nothing unusual. When I go to lower res everything works. (I actually want to go to higher res...) See image attached. Thanks, Chris
  6. I see the point of having different meshes loaded as different colors, i.e. tire and wheel-rim, so I don't want to replace this way of multi color/material print. Rather add it as an option. But as you mentioned, we are at infancy stage here and there is room for improvement. As there seems to be no technical show-stopper to this, all major slicers out there could support i.e. the Attribute Byte Cound in STL as face color and many free designer tools would adopt quickly as it is trivial to add. Meshlab already supports it this way. Plus the color would have no impact on mesh cleanliness. Smart slicers could even use infill this way to prime the extruder for tech like Prusa's multi-color. I am sure even Mark2 would profit as less interface walls need to be drawn, so faster prints and less material! As multi-color gets more and more popular we should not dismiss options just because everything else is complicated enough. The money that goes into this market rises too, so at one point this pure software upgrade could be seen as market-advantage, and I don't want to see big companies "claim" this as proprietary tech and everybody starts doing the same thing differently. It's "just" a software change, right?
  7. I was always wondering why dual-colored prints have to be so complicated and wasteful, with all the extra walls at the interior that nobody sees. If the slicer would be a bit smarter to separate vertex or face colors over some table mappings to extruder 1/2/x it should work too? No separate models would be needed, no waste, easier modeling... There is probably a good reason for this, but I could not find any by just googling it. Maybe an expert can elaborate? Thanks, Chris
  8. Look for geotiff. Topography is encoded in 16bit signed integers. Color is just for visualization. There is also a true height map that gives you the offset to a sphere, but forgot what this version of etopo1 was called. ps: my mistake, stl file is 4gb...
  9. Made this model myself from the ETOPO1 dataset. 30 times exaggerated and 1km bump for >0 elevation to make sea level visible. Projected and properly interpolated on divided icosahedron. The models you find online are all crappy with low-res. The one I printed is 1.2GB STL. I have a similar hires Mars that’s next. If I have some time I make them available on my server. Thingiverse limits at 150MB. Next is to modify the script for 2 color
  10. Thanks for the many advices. In the end the middle and upper section looks fantastic, a lot of detail I've not seen before on the Z18 with the same layer height (0.1). The loose strings from the overhang break away nicely, so after a little touch-up its not a big issue anymore. However, I'll keep in mind to build a support structure with a little lower temperature. The print was done with 2 print cores as I could not figure out how to print with one. I even had to load material and each head was calibrating... I hope the BB did not stay hot. On the negative side was the NFC stuff, extremely annoying with two spools a message popped up saying it could not read the code, after confirm it popped up again. Had to remove the spools and select manual. Where can I disable this feature? Best, Chris
  11. Thanks for the suggestions. I took some more pictures, we are half-way there. The globe has a diameter of 16cm. The Z18 has no heated print bed, so it might be the cause, but I see the same features on the infill, together with under-extrusion. As long as it stays in the interior, of course, I don't care too much. But it is worrisome... I also hear clicking noises when the extruder travels over the model, I guess it is hitting those small parts. Oh and firmware and Cura is up-to-date. Best, Chris
  12. Hmm, maybe you are right, but I am not entirely convinced that it is an overhang issue. I'll let it print and will post a picture again tomorrow evening. If you are right the upper hemisphere should look fine. The Makerbot Z18 had no (big) problems with the overhang but had of course many other faults... I'll keep you updated! Best, Chris
  13. After unboxing and setup I tried the first print with a very simple box design and everything looked fantastic. Now I was going for a more challenging print and tried the Earth, with very disappointing results (see picture). Any suggestions what could have gone wrong? The print was done with the spool in the package (350g silver PLA) and default "fine" settings in cura, only adjustment was 5% infill, no support. Thanks, Chris
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