ghostkeeper

Thanks a lot! We'll be working on it.

It essentially functions as a way to save a print target, so it saves scaling and rotation as well as positioning of multiple models and so on. This way you can easily save and replicate what exactly you print! There is no hard limit on what you can save, but it might be difficult to handle such amounts of data. The saving is done in Python with Cura but the slicing is done with the binary CuraEngine, which is able to work much more efficiently. That could explain the difference. I've just tried it myself with a 600MB ASCII-STL file, and replicated your problem. However, I saw that the file was also held open by Cura as if it was still being written. I haven't got the time to let it run for longer (it's been this way for 10 minutes) but Cura uses 0% processing power so it doesn't seem to be actually writing. I suspect that the next Cura version under development has re-written this code from scratch. Still, it's helpful for us if you file a bug report :)The currently bleeding edge version runs out of memory when I open the file... Its memory management hasn't quite been optimised yet.

It looks like the infill is protruding through the surface! First I would suggest checking if your X and Y motor belts are taut. If they aren't, there are screws on the sides of your Ultimaker that allow you to move the motors down a bit. If they are taut, you could try giving it a wider shell thickness, of twice your nozzle size or more. You can also try to reduce the infill speed (in Cura under advanced). If these didn't fix it, you can reduce the outer shell speed and inner shell speed a bit. It also looks like the printing temperature should be a bit higher but that probably has little to do with your zebra stripes.

It's normal to have some scraping if the layer height is low. It's usually a good thing, actually. The second time the nozzle goes over the material, it smoothes out the layer a bit more, just by pushing hot filament on top of it. From what I can see in your picture, it is probably scraping too much though. Too much scraping is bad though since it will result in an uneven outer surface (as well as the inside). If you see that the wire is flattened such that it becomes wider, you should probably adjust the bed a bit lower. During the bed levelling, make sure that you can put a normal 80g-weight paper between the bed and the nozzle, and that you can feel just a little friction with the nozzle when moving the paper underneath.

Since this is posted in the software/firmware category of the forums, perhaps you are thinking this is trouble with the firmware? It could also help to re-install the firmware on your Ultimaker. You can do this via Cura. Connect the printer to your computer via a USB cable, then in Cura click machine->install default firmware... This will get the latest firmware and install it on your printer. This could reset some things that might have gone awry in your printer's storage.

Only the first layer is loose then, mr? Perhaps the initial layer is shifting a bit before the second layer is applied. This could have something to do with the adhesion to the bed. I suggest you check that the bed levelling is accurate, that the bed is secure and that the print sticks well to the bed. There is a bed levelling wizard in the printer's maintenance menu to help you with the first. To make the print stick better to the bed, there are a couple of ways. You could apply some paper glue (such as Pritt) to the bed. These glues can easily be washed off the glass afterwards. You could put down a layer of painter's tape, to which many materials will stick better. Or you could lower the speed of the initial layer in Cura (under advanced settings, called "Bottom layer speed") and perhaps increase the initial layer line width (also under advanced settings). You could also reduce the initial layer thickness a bit. If that is not the problem, maybe you could clarify a bit more what's happening?

With the new infill technique coming up for the next CuraEngine release, there is a new infill method that makes triangles rather than squares. Lars' idea still holds, but it's something to keep in mind because that makes it a bit more complicated. I think the idea holds some merit, from what I know of static physics. With the same infill density, it could be stronger against certain types of force, specifically a force that is spread out throughout the surface of the object. This is because two beams stuck together will be more resistant to shear and (by extension) bending, while still having the same resistance to compression individually. Of course, the larger gaps will make the centre of these gaps weaker, so it will be weaker against sharp, piercing forces. This sort of thing requires a lot of testing, because I predict that the thicker ribs could be visible on the outside if the shell is thin, and the bigger gaps could lead to more 'rounding errors' due to the coarser discretisation of the infill (e.g. a small part could get 0% infill because it happens to fall completely within a gap). There is also the matter of exposing too many parameters to the user, though the next Cura release will streamline that somewhat better too.

It's too bad that we're not allowed to tell you about the projects people are working on here at R&D, but y'all are going to love it, I'm sure!

ごめんなさい、　Curaはソフトウェアのモデリングがありません。 僕の日本語は、だめですねえ…　すみません！